Reorganize docs into category folders and drop the retired head-review page

Group the top-level docs into docs/project, docs/design, docs/assets and
docs/process, each with its own README index. Delete the superseded
docs/screens/head-review page and sheets. Rewrite every markdown link,
absolute docs path and tool/test reference to the new locations, fix the
pre-existing broken anchors and remove the dead Joke Shop photo-board link.
check_docs OK, Python tooling 167/167.

README.md

@@ -46,13 +46,13 @@ Versions are assigned only when a track's scope is accepted into a release. Ever
 > development track remains gated on the Quaternius NPC rollout, local-map work
 > and release approvals.
 > Releases are built automatically when a `vX.Y.Z` tag is pushed
-> (see [`docs/RELEASING.md`](docs/RELEASING.md)); manual builds use
+> (see [`docs/process/RELEASING.md`](docs/process/RELEASING.md)); manual builds use
 > `./tools/build_releases.sh`. Installer/AppImage packaging runs in the same pipeline
 > (NSIS + appimagetool) and uploads with the portable binaries.
 >
 > macOS builds are unsigned: right-click → Open, or clear the quarantine with
 > `xattr -dr com.apple.quarantine gig-line-macos.zip`. Build instructions and
-> the release pipeline live in [`docs/RELEASING.md`](docs/RELEASING.md).
+> the release pipeline live in [`docs/process/RELEASING.md`](docs/process/RELEASING.md).
 
 If you are here to develop or test locally instead of downloading, jump to
 [Setup and Run](#setup-and-run) below.
@@ -112,7 +112,7 @@ current library and will be replaced after the 12 × 6 baseline review.
 | ![Crowd-variety prototypes](docs/blender_previews/sheet_npc_crowd_prototypes.jpg) | **Crowd variety prototypes.** Four approved looks (bun/slim, bald/broad, coat/umbrella, hood/cup) queued for the roster build. |
 
 More sheets and the review criteria are in [`docs/blender_previews/`](docs/blender_previews/README.md)
-and [`docs/3d-model-review.md`](docs/3d-model-review.md).
+and [`docs/assets/3d-model-review.md`](docs/assets/3d-model-review.md).
 
 ## Game Overview
 
@@ -122,7 +122,7 @@ tickets or credentials, and escalate only when necessary. The game rewards calm
 resolution over force. The venue menu splits Hollywood Boulevard into Day and
 Night rows; the full mechanics — the three venues, the six-level
 escalation model, and the core systems — are in
-[`docs/gameplay.md`](docs/gameplay.md); the design rationale lives in
+[`docs/design/gameplay.md`](docs/design/gameplay.md); the design rationale lives in
 [`PLAN.md`](PLAN.md).
 
 ## Architecture
@@ -130,8 +130,8 @@ escalation model, and the core systems — are in
 A venue-driven simulation: shared systems (movement, perception, interaction,
 access verification, escalation, radio, crowd, reputation, evidence, shift
 review) driven by per-venue scenario data, on Godot 4 + GDScript. The full
-arc42-style document is [`docs/architecture.md`](docs/architecture.md);
-decisions are recorded as ADRs in [`docs/adr/`](docs/adr/).
+arc42-style document is [`docs/project/architecture.md`](docs/project/architecture.md);
+decisions are recorded as ADRs in [`docs/adr/`](docs/adr).
 
 ## Tech Stack
 
@@ -144,7 +144,7 @@ decisions are recorded as ADRs in [`docs/adr/`](docs/adr/).
 - **Targets:** Windows, Linux, macOS, Web
 
 The asset pipelines, model tools, and screenshot gates are documented in
-[`docs/asset-tooling.md`](docs/asset-tooling.md).
+[`docs/assets/asset-tooling.md`](docs/assets/asset-tooling.md).
 
 ## Setup and Run
 
@@ -157,36 +157,36 @@ godot --headless --path . --script res://src/test/test_runner.gd   # run all tes
 ```
 
 Full setup, every run/test/smoke command, and the controls table are in
-[`docs/getting-started.md`](docs/getting-started.md).
+[`docs/process/getting-started.md`](docs/process/getting-started.md).
 
 ## Project Documentation
 
 - [`PLAN.md`](PLAN.md) — Game design plan, development priorities and scenario details.
 - [`TODO.md`](TODO.md) — Priority-ordered tasks: character and local-map development, release milestones, and future work.
 - [`docs/README.md`](docs/README.md) — Documentation index, current priorities and visual previews.
-- [`docs/npc-model-sourcing.md`](docs/npc-model-sourcing.md) — Character-source evaluation, licence rules and the character-development plan.
-- [`docs/makehuman-head-review.md`](docs/makehuman-head-review.md) — Local MakeHuman head prototype, provenance and review verdict.
+- [`docs/assets/npc-model-sourcing.md`](docs/assets/npc-model-sourcing.md) — Character-source evaluation, licence rules and the character-development plan.
+- [`docs/assets/makehuman-head-review.md`](docs/assets/makehuman-head-review.md) — Local MakeHuman head prototype, provenance and review verdict.
 - [`AGENTS.md`](AGENTS.md) — Development, commit, build and collaboration workflow.
 - [`DONE.md`](DONE.md) — Completed task sections.
 - [`MEMORY.md`](MEMORY.md) — Persistent session notes.
 - [`CHANGELOG.md`](CHANGELOG.md) — User-facing changes by version.
-- [`docs/architecture.md`](docs/architecture.md) — arc42-style architecture documentation.
-- [`docs/gameplay.md`](docs/gameplay.md) — Gameplay systems, venues, and the escalation model.
-- [`docs/venues.md`](docs/venues.md) — Real-site references, game mapping and limitations for Hollywood, the Joke Shop and the TV Studio.
-- [`docs/asset-tooling.md`](docs/asset-tooling.md) — Asset pipelines, model tools, and screenshot gates.
+- [`docs/project/architecture.md`](docs/project/architecture.md) — arc42-style architecture documentation.
+- [`docs/design/gameplay.md`](docs/design/gameplay.md) — Gameplay systems, venues, and the escalation model.
+- [`docs/design/venues.md`](docs/design/venues.md) — Real-site references, game mapping and limitations for Hollywood, the Joke Shop and the TV Studio.
+- [`docs/assets/asset-tooling.md`](docs/assets/asset-tooling.md) — Asset pipelines, model tools, and screenshot gates.
 - [`tools/README.md`](tools/README.md) — Tool inventory, categories, test commands and AI-skill evaluation.
 - [`.agents/skills/gig-line-blender-asset-contract`](.agents/skills/gig-line-blender-asset-contract/SKILL.md) — tracked AI skill for Blender/NPC/gear asset work.
 - [`.agents/skills/gig-line-release-qa`](.agents/skills/gig-line-release-qa/SKILL.md) — tracked AI skill for release and visual-QA work.
-- [`docs/getting-started.md`](docs/getting-started.md) — Setup, run/test commands, and controls.
-- [`docs/development-status.md`](docs/development-status.md) — Implemented features and what's next.
-- [`docs/accessibility.md`](docs/accessibility.md) — Accessibility features, known gaps and statement.
-- [`docs/known-limitations.md`](docs/known-limitations.md) — Release-candidate blockers and accepted limitations.
-- [`docs/release-qa.md`](docs/release-qa.md) — Manual smoke checklist and release-candidate balance protocol.
+- [`docs/process/getting-started.md`](docs/process/getting-started.md) — Setup, run/test commands, and controls.
+- [`docs/project/development-status.md`](docs/project/development-status.md) — Implemented features and what's next.
+- [`docs/design/accessibility.md`](docs/design/accessibility.md) — Accessibility features, known gaps and statement.
+- [`docs/design/known-limitations.md`](docs/design/known-limitations.md) — Release-candidate blockers and accepted limitations.
+- [`docs/process/release-qa.md`](docs/process/release-qa.md) — Manual smoke checklist and release-candidate balance protocol.
 - [`CREDITS.md`](CREDITS.md) — Credits, AI/reference provenance and licensing notes.
 - [`PRIVACY.md`](PRIVACY.md) — Local-only data, save files and development API use.
-- [`docs/blender-assets.md`](docs/blender-assets.md) — Blender asset library: characters, gear, props, attach points.
-- [`docs/npc-model-sourcing.md`](docs/npc-model-sourcing.md) — character sources, the shipped roster table and the build steps; 0.9.5 texture comparison is in [`docs/blender_previews/sheet_texture_refinement_0.9.5.jpg`](docs/blender_previews/sheet_texture_refinement_0.9.5.jpg).
-- [`docs/adr/`](docs/adr/) — Architecture Decision Records.
+- [`docs/assets/blender-assets.md`](docs/assets/blender-assets.md) — Blender asset library: characters, gear, props, attach points.
+- [`docs/assets/npc-model-sourcing.md`](docs/assets/npc-model-sourcing.md) — character sources, the shipped roster table and the build steps; 0.9.5 texture comparison is in [`docs/blender_previews/sheet_texture_refinement_0.9.5.jpg`](docs/blender_previews/sheet_texture_refinement_0.9.5.jpg).
+- [`docs/adr/`](docs/adr) — Architecture Decision Records.
 
 ## Development Status
 
@@ -198,9 +198,9 @@ UI/accessibility polish, 0.9.2 Hollywood/Joke Shop maps and the 0.9.x engine
 baseline. The active work is the `0.9.9`–`0.9.12` patch line (Quaternius NPC
 base, roster, venue/asset polish, performance) followed by the `0.10.0`
 public-readiness minor. See
-[`docs/development-status.md`](docs/development-status.md) for the implemented list
+[`docs/project/development-status.md`](docs/project/development-status.md) for the implemented list
 and [`TODO.md`](TODO.md) for the priority-ordered roadmap. Manual verification uses
-[`docs/release-qa.md`](docs/release-qa.md).
+[`docs/process/release-qa.md`](docs/process/release-qa.md).
 
 ## Credits, Privacy and Accessibility
 
@@ -209,8 +209,8 @@ network service, and saves stay in Godot's local `user://` folder. The
 body-camera overlay is simulated. Asset provenance, AI-assisted image usage and
 credits are recorded in [`CREDITS.md`](CREDITS.md); the local-data policy is in
 [`PRIVACY.md`](PRIVACY.md); accessibility features and gaps are in
-[`docs/accessibility.md`](docs/accessibility.md); and release-candidate blockers
-are listed in [`docs/known-limitations.md`](docs/known-limitations.md).
+[`docs/design/accessibility.md`](docs/design/accessibility.md); and release-candidate blockers
+are listed in [`docs/design/known-limitations.md`](docs/design/known-limitations.md).
 
 ## Development Workflow