diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
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--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,48 @@
+# Contributing
+
+NETfishing is currently developed through focused changes on the repository's
+active development branch. Coordinate scope with the project owner before
+starting substantial work.
+
+## Change discipline
+
+- Keep a change focused; avoid unrelated cleanup.
+- Inspect the working tree before editing and preserve existing work.
+- Do not change protocol, save, settings, identity, or portable-data versions
+  as release-label housekeeping.
+- Treat the host as authoritative for catches, purchases, sales, jobs, mail,
+  and other shared state.
+- Keep presentation-only systems out of save files and network messages.
+- Store runtime assets under repository-owned paths; never reference a
+  workstation sync or temporary directory.
+- Record the source and license of newly imported assets.
+- Do not commit `.godot/`, test data, logs, captures, or build outputs.
+
+## Before requesting review
+
+```sh
+git diff --check
+scripts/run_validations.sh quick
+git status --short
+```
+
+Choose additional focused tests from [`docs/TESTING.md`](docs/TESTING.md).
+Changes involving networking should run the network suite and a real
+two-process check. Visual changes still require graphical review; headless
+tests are supporting evidence, not a replacement.
+
+## Commits
+
+- Stage audited paths explicitly.
+- Use a concise imperative subject that describes the outcome.
+- Do not mix generated build artifacts with source changes.
+- Do not rewrite published release tags.
+- Describe behavior, compatibility impact, validation, and asset provenance in
+  the review or release record.
+
+## Style
+
+Follow the conventions already present in the surrounding GDScript, scene, and
+resource files. Prefer typed values, named constants, shared resources, and
+small domain-specific services. Avoid duplicating protocol definitions or
+using display strings as persistent identifiers.
diff --git a/CREDITS.md b/CREDITS.md
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--- /dev/null
+++ b/CREDITS.md
@@ -0,0 +1,50 @@
+# Credits
+
+## Project direction
+
+NETfishing is designed, directed, reviewed, and released by its project
+creator. A public-facing creator or studio credit has not yet been recorded in
+this repository.
+
+## Development assistance
+
+Development has used automated coding assistance for implementation,
+investigation, testing, documentation, and review. Design choices, supplied
+artwork, acceptance decisions, repository operations, and releases remain
+human-controlled.
+
+This disclosure is intentionally about process. Commit style, code style, or
+repository metadata cannot reliably prove whether a particular change was
+written with or without assistance.
+
+## Fonts
+
+- Tuffy: Thatcher Ulrich, Karoly Barta, and Michael Evans. The bundled license
+  dedicates the work to the public domain; see `ui/fonts/Tuffy-LICENSE.txt`.
+- Seattle Avenue: bundled as `ui/fonts/seattle_avenue.otf`. Author and
+  redistribution terms still need to be recorded before public distribution.
+
+## Music
+
+- `audio/music/title/as_in_four_wolves.ogg`: original title/ambient music by
+  the project owner.
+
+## Sound effects
+
+- “Spinning reel.wav” by tosha73, used as the source for the fishing fight and
+  manual-reeling loops. Freesound sound 509902, Creative Commons Zero (CC0):
+  https://freesound.org/s/509902/
+- “Gentle Ocean Waves Loop” by kkenny101, used for the saltwater shoreline
+  ambience. Freesound sound 852826, Creative Commons Zero (CC0):
+  https://freesound.org/s/852826/
+- “Quick Water Droplet” by qubodup, used for the bobber water-impact sound.
+  Freesound sound 792931, Creative Commons Zero (CC0):
+  https://freesound.org/s/792931/
+
+## Artwork
+
+- 2D artwork: Rheannon Eisworth, contributor.
+- 3D models: original work by the project owner.
+
+Asset categories and release-record requirements are listed in
+[`docs/ASSET-PROVENANCE.md`](docs/ASSET-PROVENANCE.md).
diff --git a/README.md b/README.md
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+++ b/README.md
@@ -0,0 +1,82 @@
+# NETfishing
+
+NETfishing is a multiplayer-first fishing game built with Godot 4.7. The
+current pre-alpha includes host-authoritative fishing and economy flows,
+freshwater and saltwater habitats, persistent player data, social features,
+customization, jobs, and a controller-aware interface.
+
+The project is under active development. Interfaces, balance, content, and
+save migrations may continue to change before a stable release.
+
+## Requirements
+
+- Godot 4.7.x with the GL Compatibility renderer
+- Linux, Windows, or an Android development environment supported by Godot
+- Bash for the repository helper scripts
+
+Open `project.godot` in Godot, or start the editor from the repository root:
+
+```sh
+godot --editor --path .
+```
+
+Run the game directly with:
+
+```sh
+godot --path .
+```
+
+## Validation
+
+The validation scripts isolate Godot's settings and application-data roots.
+Run the fast, deterministic suite before submitting a change:
+
+```sh
+scripts/run_validations.sh quick
+```
+
+Additional suites and individual commands are documented in
+[`docs/TESTING.md`](docs/TESTING.md).
+
+## Building
+
+Export presets are maintained for Linux, Windows, and Android. Repository
+scripts expect the matching Godot export templates and platform toolchains to
+already be installed:
+
+```sh
+scripts/build_playtest.sh
+scripts/build_android_debug.sh
+```
+
+Build outputs belong under the ignored `builds/` directory. Release builds
+must follow the project's separate tagged-release checklist; these convenience
+scripts do not create or publish tags.
+
+## Project map
+
+- `main/`: composition root and application orchestration
+- `world/`: map, environment, water, and world presentation
+- `player/`, `fishing/`, `fish/`: player and fishing domain
+- `network/`: transport, identity, and host-authoritative services
+- `inventory/`, `items/`, `economy/`, `progression/`, `jobs/`: game state
+- `save/`, `settings/`: versioned persistence
+- `ui/`: gameplay and menu presentation
+- `tests/`: focused Godot validation scripts
+- `scripts/`: build, bake, and validation entry points
+
+See [`docs/ARCHITECTURE.md`](docs/ARCHITECTURE.md) and
+[`world/README-WORLD-AUTHORING.md`](world/README-WORLD-AUTHORING.md) for more
+detail.
+
+## Authorship and assets
+
+NETfishing is human-directed and uses a mixture of human-authored assets and
+software-development assistance. The project records this plainly rather than
+claiming that repository history can prove how each line was produced. See
+[`CREDITS.md`](CREDITS.md) and
+[`docs/ASSET-PROVENANCE.md`](docs/ASSET-PROVENANCE.md).
+
+No project-wide source license has been selected yet. Do not assume permission
+to redistribute the source or bundled assets beyond rights stated in their
+individual license records.
diff --git a/docs/ARCHITECTURE.md b/docs/ARCHITECTURE.md
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index 0000000..373c800
--- /dev/null
+++ b/docs/ARCHITECTURE.md
@@ -0,0 +1,72 @@
+# Architecture
+
+## Composition
+
+`main/main.tscn` is the application composition root. It owns long-lived
+services, the active world, player container, save/settings managers, and the
+pixelated UI viewport. Services are scene-owned rather than global autoloads,
+which makes their dependencies visible in the main scene and allows focused
+tests to instantiate the same composition.
+
+The main script coordinates title, session, world, and UI lifecycle. Domain
+logic remains in typed resources and services rather than being stored solely
+in controls.
+
+## Domain boundaries
+
+- `fish/` defines species, availability, catches, pools, quality, and selection.
+- `fishing/` owns cast/chase state and resolves authoritative fishing surfaces.
+- `inventory/`, `items/`, `economy/`, `progression/`, and `jobs/` own persistent
+  player-facing game state.
+- `world/` owns authored map composition and presentation. Water type is a
+  shared typed definition used by water bodies, fish habitat, fishing
+  validation, Logbook classification, and saltwater shoreline presentation.
+- `ui/` observes and invokes domain services. It does not define stable item or
+  fish identity.
+
+Resource files (`.tres`) are authored data. Stable IDs, not display names or
+node names, connect persistent and networked state to that data.
+
+## Networking
+
+`NetworkSession` owns ENet session lifecycle and peer registration. Dedicated
+network services validate and replicate bounded domains such as fishing,
+sales, shops, item use, profiles, jobs, mail, chat, drawings, time, and weather.
+
+The host is authoritative. Clients submit requests or evidence; the host
+derives trusted context from registered peers, authoritative regions, and
+server-owned state before mutating inventory, wallet, progression, or shared
+world state. See [`decisions/0001-host-authority.md`](decisions/0001-host-authority.md).
+
+Protocol compatibility is defined in `network/network_protocol.gd`. A visible
+release version is not a reason to change the protocol number.
+
+## Persistence
+
+`PlayerDataRoot` selects and validates a portable data root. Stores receive
+paths from that owner rather than inventing unrelated locations. Progression is
+written by `PlayerSaveManager`; device settings and social/identity stores have
+separate formats and lifecycles.
+
+Save migrations are sequential and explicit. Existing catches and ownership
+are keyed by stable IDs so authored metadata can evolve without rewriting
+historical records. Current source constants—not documentation—are
+authoritative for format versions.
+
+## Presentation
+
+Gameplay is rendered in 3D with the GL Compatibility renderer. The main UI is
+presented through a uniformly scaled SubViewport. Shared UI components and
+palette resources prevent page-specific geometry and style drift.
+
+World presentation systems (time/weather visuals, procedural sky and water,
+shoreline ribbons, player blob shadows) do not own gameplay collision or
+network authority. Generated shoreline meshes are deterministic presentation
+resources baked from explicitly configured static terrain.
+
+## Validation
+
+Tests are executable Godot `SceneTree` scripts. Some are pure content/domain
+checks, some instantiate the main scene, and multiplayer checks run paired host
+and client processes on loopback. The repository runner provides isolation and
+consistent entry points; see [`TESTING.md`](TESTING.md).
diff --git a/docs/ASSET-PROVENANCE.md b/docs/ASSET-PROVENANCE.md
new file mode 100644
index 0000000..9c3bc76
--- /dev/null
+++ b/docs/ASSET-PROVENANCE.md
@@ -0,0 +1,109 @@
+# Asset provenance
+
+This document records where runtime assets came from and what must be verified
+before redistribution. A Git commit proves when bytes entered this repository;
+it does not by itself prove authorship or licensing.
+
+## Intake policy
+
+For every new external or supplied asset, record:
+
+- creator or supplying party;
+- original source location or delivery channel;
+- source filename and repository destination;
+- source and destination SHA-256 when copied without modification;
+- license or explicit permission;
+- any permitted transformations;
+- the importing commit or release.
+
+Runtime resources must use `res://` paths. Workstation Sync folders are intake
+locations only and must never appear in scenes or resources.
+
+## Current inventory
+
+| Asset family | Repository location | Recorded provenance |
+| --- | --- | --- |
+| Fish art and portraits | `fish/species/`, `art/exported/fish/` | 2D artwork by contributor Rheannon Eisworth. |
+| Item icons | `items/icons/` | 2D artwork by contributor Rheannon Eisworth. |
+| Inventory notepad | `art/ui/ui_notepad.png` | 2D artwork by contributor Rheannon Eisworth; integrated without a runtime external path. |
+| Environment textures | `art/exported/environment/textures/` | 2D artwork by contributor Rheannon Eisworth. |
+| UI patterns | `art/patterns/` | 2D artwork by contributor Rheannon Eisworth. |
+| Character and world models | `art/exported/` | Original 3D models by the project owner. Any embedded 2D artwork is by Rheannon Eisworth. |
+| Tuffy font | `ui/fonts/Tuffy_Bold.otf` | Public-domain dedication in `ui/fonts/Tuffy-LICENSE.txt`. |
+| Seattle Avenue font | `ui/fonts/seattle_avenue.otf` | License and attribution not present; resolve before public distribution. |
+| Title music | `audio/music/title/as_in_four_wolves.ogg` | Original music composed and owned by the project owner. |
+| Fishing fight loop | `audio/sfx/fishing/fighting.wav` | Edited from “Spinning reel.wav” by Freesound user tosha73, sound 509902, CC0. |
+| Manual-reeling loop | `audio/sfx/fishing/reeling.wav` | Edited from the same CC0 “Spinning reel.wav” source. |
+| Saltwater wave ambience | `audio/ambience/waves.wav` | “Gentle Ocean Waves Loop” by Freesound user kkenny101, sound 852826, CC0. |
+| Bobber water impact | `audio/sfx/fishing/bobber.wav` | “Quick Water Droplet” by Freesound user qubodup, sound 792931, CC0. |
+
+### Fishing fight loop source record
+
+- Source page: https://freesound.org/s/509902/
+- Creator: tosha73
+- Source title: `Spinning reel.wav`
+- License: Creative Commons Zero (CC0)
+- Downloaded source filename: `509902__tosha73__spinning-reel.wav`
+- Downloaded source SHA-256:
+  `9741afdb1ec9c73f5e039f0e5ac174998cb0a1f737b626531e63919d4d232fad`
+- Audacity working project: `fighting.aup3`
+- Audacity project SHA-256:
+  `9928f077ecf48d01416f8d05700707e1b07d0f731846db80e27116f5b82dbbf5`
+- Runtime edit source/destination SHA-256:
+  `b6f3f2f94bfaf9254ac04dd96b1fd28c15e1011a1db44bb3e70eeaa95de3c212`
+- Runtime format: 48 kHz, 16-bit, stereo PCM WAV; 2.593479 seconds;
+  configured as a forward loop by the fishing presentation.
+- Manual-reeling Audacity project: `reeling.aup3`
+- Manual-reeling Audacity project SHA-256:
+  `20ad52f6bdd16ae6561f06f8355fe309e95023e815053fd5dfbd5a5ce3c1f9f9`
+- Manual-reeling runtime source/destination SHA-256:
+  `e403d5b7c8af1da4b28599cc0f51de3eda70d9e9296db27852fe7dc95617a29d`
+- Manual-reeling runtime format: 48 kHz, 16-bit, stereo PCM WAV;
+  2.388083 seconds; configured as a forward loop.
+- The downloaded source and Audacity projects remain in the project owner's
+  source-work archive; only the finished runtime edits ship in the game.
+
+### Saltwater wave ambience source record
+
+- Source page: https://freesound.org/s/852826/
+- Creator: kkenny101
+- Source title: `Gentle Ocean Waves Loop`
+- License: Creative Commons Zero (CC0)
+- Downloaded source filename:
+  `852826__kkenny101__gentle-ocean-waves-loop.wav`
+- Downloaded source and runtime source/destination SHA-256:
+  `f93e9890583f072ac52cf197b8b5942397d3d5e889fbdb9112a0776142f50229`
+- Runtime format: 48 kHz, 24-bit, mono PCM WAV; 21.769917 seconds;
+  configured as a forward loop.
+- The downloaded source remains in the project owner's source-work archive;
+  only the finished runtime loop ships in the game.
+
+### Bobber water-impact source record
+
+- Source page: https://freesound.org/s/792931/
+- Creator: qubodup
+- Source title: `Quick Water Droplet`
+- License: Creative Commons Zero (CC0)
+- Downloaded source filename: `792931__qubodup__quick-water-droplet.wav`
+- Downloaded source and runtime source/destination SHA-256:
+  `aef0d16384efed4a7b071c4d80c21597617f882f4e0c1d5295ac194d315eafb7`
+- Runtime format: 48 kHz, 16-bit, mono PCM WAV; 0.197146 seconds; one-shot.
+- The downloaded source remains in the project owner's source-work archive;
+  only the finished runtime sound ships in the game.
+
+## Generated resources
+
+Godot `.import` sidecars and deterministic shoreline `.tres` meshes are derived
+repository resources, not original artwork. `.godot/imported/`, editor caches,
+captures, exports, and temporary test data are not tracked.
+
+## Release gate
+
+Before a public binary or source release:
+
+1. Resolve the Seattle Avenue font license and attribution gap above.
+2. Record the public owner/studio credit and the contributor's redistribution
+   permission in the chosen project license or release records.
+3. Confirm the project-wide source/content license selected by the owner.
+4. Search exported resources for external filesystem paths.
+5. Preserve required third-party notices with the package.
diff --git a/docs/BALANCE.md b/docs/BALANCE.md
new file mode 100644
index 0000000..948b882
--- /dev/null
+++ b/docs/BALANCE.md
@@ -0,0 +1,41 @@
+# Balance and content notes
+
+Balance is authored data and should change deliberately. This document records
+the policy; exact current values remain authoritative in `.tres` resources and
+typed scripts.
+
+## Fish
+
+- Stable fish IDs and catalog numbers must not be changed for display cleanup.
+- Species availability may constrain water type, time, weather, bait, and other
+  authored context.
+- Location pools control selection weight; the global catalog remains
+  comprehensive.
+- Freshwater/saltwater habitat is validated by the host in addition to pool
+  membership.
+- Value, rarity, quality, and weight ranges should be reviewed together because
+  they affect economy and catch difficulty.
+
+## Economy and progression
+
+- Sales and purchases are host-authoritative and must mutate inventory and
+  wallet exactly once.
+- Reserved assets are rejected atomically; mixed valid/reserved batches must
+  not partially succeed.
+- Item effects, shop prices, cooler capacity, fishing upgrades, jobs, and
+  experience are separate balance axes. Avoid changing several in an unrelated
+  presentation pass.
+
+## Recording a balance change
+
+Include in the change description:
+
+1. affected stable IDs and resource paths;
+2. old and new values;
+3. intended player-facing outcome;
+4. interactions with quality, availability, and economy;
+5. deterministic validation performed;
+6. whether existing saves remain semantically valid.
+
+Do not bump the save schema or network protocol simply because an authored
+number changed. Bump a format only when its serialized contract changes.
diff --git a/docs/TESTING.md b/docs/TESTING.md
new file mode 100644
index 0000000..e70455b
--- /dev/null
+++ b/docs/TESTING.md
@@ -0,0 +1,63 @@
+# Testing
+
+NETfishing validations are Godot `SceneTree` scripts. They use assertions and
+exit nonzero on failure. Run them with isolated user data so development checks
+cannot touch real saves, identity, trust, relationships, or settings.
+
+## Consolidated runner
+
+```sh
+scripts/run_validations.sh quick
+scripts/run_validations.sh full
+scripts/run_validations.sh host
+scripts/run_validations.sh network
+scripts/run_validations.sh all
+scripts/run_validations.sh --list
+```
+
+- `quick` runs deterministic content and domain validations.
+- `full` adds socket-free scene/runtime checks suitable for headless execution.
+- `host` runs single-process authoritative-host checks that bind a local UDP
+  port.
+- `network` runs the loopback host/client validations in pairs.
+- `all` runs `full`, `host`, and then `network`.
+
+Set `GODOT_BIN` to select another executable. Set `TEST_TIMEOUT_SECONDS` to
+change the per-process timeout. The runner creates one temporary XDG root per
+process and removes it on exit.
+
+## One focused test
+
+```sh
+test_root="$(mktemp -d)"
+XDG_DATA_HOME="$test_root/data" \
+XDG_CONFIG_HOME="$test_root/config" \
+godot --headless --path . --script tests/fish_catalog_content_validation.gd
+rm -rf -- "$test_root"
+```
+
+Do not set `NETFISHING_DATA_DIR` to an arbitrary empty folder: that variable is
+an explicit portable-data override and must point at a valid NETfishing data
+root. Isolating XDG paths is sufficient for the validation scripts.
+
+## Graphical checks
+
+Headless tests cannot prove visual alignment, actual mouse routing, shader
+appearance, controller feel, or window-resize behavior. Presentation changes
+need a real graphical startup with isolated XDG roots and inspection at the
+canonical 1280×720 layout plus relevant low/high and ultrawide resolutions.
+
+## Network checks
+
+Host and paired tests bind loopback UDP ports defined in their scripts. Ensure
+no old Godot validation process is holding those ports and that the execution
+environment permits local sockets. The runner starts paired hosts before their
+clients and requires both processes to exit successfully. Network tests do not
+contact external servers.
+
+## Release checks
+
+A release audit additionally includes clean Git/tag verification, editor import,
+export-template checks, platform exports, executable smoke tests, archive
+inspection, and SHA-256 verification. Those checks are intentionally not hidden
+inside the development runner.
diff --git a/docs/decisions/0001-host-authority.md b/docs/decisions/0001-host-authority.md
new file mode 100644
index 0000000..f134d93
--- /dev/null
+++ b/docs/decisions/0001-host-authority.md
@@ -0,0 +1,27 @@
+# ADR 0001: Host-authoritative shared state
+
+Status: accepted
+
+## Context
+
+NETfishing supports private hosts, open hosts, and joined clients. Catches,
+currency, owned items, jobs, mail, drawings, profiles, and moderation affect
+state that cannot safely trust a client's local presentation.
+
+## Decision
+
+The host validates requests against registered peers and host-owned context,
+then performs the authoritative mutation. Clients receive results and replicated
+presentation state. Client evidence is bounded and reconstructed where
+possible; it is not treated as authority.
+
+Private single-player uses the same host path. Presentation-only state does not
+add RPCs or persistence.
+
+## Consequences
+
+- Shared behavior is consistent across private, open-host, and joined-client
+  modes.
+- Tests must cover local-host and paired host/client paths.
+- Stable protocol payloads and rejection cleanup require explicit handling.
+- UI activation cannot be used as proof that a server-side mutation succeeded.
diff --git a/docs/decisions/0002-authored-data-and-stable-ids.md b/docs/decisions/0002-authored-data-and-stable-ids.md
new file mode 100644
index 0000000..23163cb
--- /dev/null
+++ b/docs/decisions/0002-authored-data-and-stable-ids.md
@@ -0,0 +1,27 @@
+# ADR 0002: Authored resources and stable identifiers
+
+Status: accepted
+
+## Context
+
+Fish, items, pools, availability, shop stock, and other game content evolve
+independently from saved catches and network messages. Display labels and scene
+node names are expected to change during development.
+
+## Decision
+
+Repository-owned resources are the authoritative authored data. Persistent and
+networked records refer to stable IDs. Display names, filenames, node names,
+coordinates, and pool names are not compatibility identifiers.
+
+Cross-domain concepts such as water type use one typed definition rather than
+duplicated strings. Comprehensive catalogs remain separate from location-
+specific selection pools.
+
+## Consequences
+
+- Renaming visible UI does not require save migration.
+- Removing or changing a stable ID requires an explicit compatibility plan.
+- Content validation checks uniqueness, catalog completeness, pool membership,
+  and typed habitat compatibility.
+- New authored assets need provenance records as well as resource references.
diff --git a/scripts/run_validations.sh b/scripts/run_validations.sh
new file mode 100755
index 0000000..1fa7312
--- /dev/null
+++ b/scripts/run_validations.sh
@@ -0,0 +1,186 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+readonly SCRIPT_DIR="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
+readonly PROJECT_ROOT="$(cd -- "${SCRIPT_DIR}/.." && pwd)"
+readonly GODOT_BIN="${GODOT_BIN:-godot}"
+readonly TEST_TIMEOUT_SECONDS="${TEST_TIMEOUT_SECONDS:-120}"
+readonly RUN_ROOT="$(mktemp -d -t netfishing-validations.XXXXXX)"
+
+readonly -a QUICK_TESTS=(
+	"tests/android_readiness_validation.gd"
+	"tests/fish_catalog_content_validation.gd"
+	"tests/fish_quality_validation.gd"
+	"tests/fishing_audio_validation.gd"
+	"tests/fishing_surface_validation.gd"
+	"tests/logbook_validation.gd"
+	"tests/player_experience_validation.gd"
+	"tests/shoreline_ambience_validation.gd"
+	"tests/surface_drawing_validation.gd"
+	"tests/terrain_projection_validation.gd"
+	"tests/world_time_validation.gd"
+	"tests/world_weather_validation.gd"
+)
+
+readonly -a RUNTIME_TESTS=(
+	"tests/inventory_notepad_art_validation.gd"
+	"tests/logbook_runtime_validation.gd"
+	"tests/player_experience_ui_validation.gd"
+	"tests/ui_scaling_runtime_validation.gd"
+)
+
+readonly -a HOST_TESTS=(
+	"tests/art_tools_validation.gd"
+	"tests/economy_regression_validation.gd"
+	"tests/fish_hotbar_showcase_validation.gd"
+	"tests/fishing_authority_validation.gd"
+	"tests/job_system_validation.gd"
+	"tests/surface_drawing_runtime_validation.gd"
+)
+
+readonly -a NETWORK_TESTS=(
+	"tests/economy_regression_validation.gd"
+	"tests/fish_showcase_multiplayer_validation.gd"
+	"tests/fishing_multiplayer_validation.gd"
+	"tests/job_multiplayer_validation.gd"
+	"tests/surface_drawing_multiplayer_validation.gd"
+	"tests/world_time_multiplayer_validation.gd"
+)
+
+cleanup() {
+	rm -rf -- "${RUN_ROOT}"
+}
+trap cleanup EXIT INT TERM
+
+usage() {
+	printf 'Usage: %s {quick|full|host|network|all|--list}\n' "$0"
+}
+
+prepare_root() {
+	local name="$1"
+	local root="${RUN_ROOT}/${name}"
+	mkdir -p -- "${root}/data" "${root}/config" "${root}/cache"
+	printf '%s\n' "${root}"
+}
+
+run_test() {
+	local script="$1"
+	local name="${script#tests/}"
+	name="${name%.gd}"
+	local root
+	root="$(prepare_root "${name}")"
+	printf '\n==> %s\n' "${script}"
+	XDG_DATA_HOME="${root}/data" \
+	XDG_CONFIG_HOME="${root}/config" \
+	XDG_CACHE_HOME="${root}/cache" \
+	timeout "${TEST_TIMEOUT_SECONDS}s" "${GODOT_BIN}" \
+		--headless --path "${PROJECT_ROOT}" --script "${script}"
+}
+
+run_network_test() {
+	local script="$1"
+	local name="${script#tests/}"
+	name="${name%.gd}"
+	local host_root client_root host_pid host_status client_status
+	host_root="$(prepare_root "${name}-host")"
+	client_root="$(prepare_root "${name}-client")"
+	printf '\n==> %s (host + client)\n' "${script}"
+	XDG_DATA_HOME="${host_root}/data" \
+	XDG_CONFIG_HOME="${host_root}/config" \
+	XDG_CACHE_HOME="${host_root}/cache" \
+	timeout "${TEST_TIMEOUT_SECONDS}s" "${GODOT_BIN}" \
+		--headless --path "${PROJECT_ROOT}" --script "${script}" -- host \
+		>"${host_root}/output.log" 2>&1 &
+	host_pid=$!
+	sleep 0.75
+	set +e
+	XDG_DATA_HOME="${client_root}/data" \
+	XDG_CONFIG_HOME="${client_root}/config" \
+	XDG_CACHE_HOME="${client_root}/cache" \
+	timeout "${TEST_TIMEOUT_SECONDS}s" "${GODOT_BIN}" \
+		--headless --path "${PROJECT_ROOT}" --script "${script}" -- client \
+		>"${client_root}/output.log" 2>&1
+	client_status=$?
+	wait "${host_pid}"
+	host_status=$?
+	set -e
+	printf '%s\n' '-- host output --'
+	sed -n '1,240p' "${host_root}/output.log"
+	printf '%s\n' '-- client output --'
+	sed -n '1,240p' "${client_root}/output.log"
+	if ((host_status != 0 || client_status != 0)); then
+		printf 'error: host exited %d; client exited %d\n' \
+			"${host_status}" "${client_status}" >&2
+		return 1
+	fi
+}
+
+run_quick() {
+	local test_script
+	for test_script in "${QUICK_TESTS[@]}"; do
+		run_test "${test_script}"
+	done
+}
+
+run_full() {
+	local test_script
+	run_quick
+	for test_script in "${RUNTIME_TESTS[@]}"; do
+		run_test "${test_script}"
+	done
+}
+
+run_host() {
+	local test_script
+	for test_script in "${HOST_TESTS[@]}"; do
+		run_test "${test_script}"
+	done
+}
+
+run_network() {
+	local test_script
+	for test_script in "${NETWORK_TESTS[@]}"; do
+		run_network_test "${test_script}"
+	done
+}
+
+list_tests() {
+	printf '%s\n' 'Quick tests:'
+	printf '  %s\n' "${QUICK_TESTS[@]}"
+	printf '%s\n' 'Additional full-suite tests:'
+	printf '  %s\n' "${RUNTIME_TESTS[@]}"
+	printf '%s\n' 'Single-process tests requiring a local UDP bind:'
+	printf '  %s\n' "${HOST_TESTS[@]}"
+	printf '%s\n' 'Paired network tests:'
+	printf '  %s\n' "${NETWORK_TESTS[@]}"
+}
+
+case "${1:-}" in
+	quick)
+		run_quick
+		;;
+	full)
+		run_full
+		;;
+	host)
+		run_host
+		;;
+	network)
+		run_network
+		;;
+	all)
+		run_full
+		run_host
+		run_network
+		;;
+	--list)
+		list_tests
+		;;
+	*)
+		usage >&2
+		exit 2
+		;;
+esac
+
+printf '\nAll requested validations passed.\n'