docs: ✏️ cleanup and organize docs

docs/README.md

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+# Documentation Map
+
+A central index of the documentation in this repo. The goal of the project is to
+build KiCad with WASM and run it in a browser.
+
+> Note: per-area `README.md` files stay next to the code they describe (they're linked
+> below). Cross-cutting guides live under `docs/`. Per-feature design notes live under
+> [`features/`](features/).
+
+## Start here
+
+- [Project README](../README.md) — overview, prerequisites, quick start, project structure
+- [CLAUDE.md](../CLAUDE.md) — project/agent context and contribution conventions
+
+## Build
+
+- [docs/build.md](build.md) — Docker-based KiCad WASM build system (two-phase build, outputs, memory)
+- [docker/README.md](../docker/README.md) — Docker build environment, branch-specific containers, troubleshooting
+- [wasm/README.md](../wasm/README.md) — WASM compatibility layer (overrides/shims without patching KiCad)
+
+## Debugging & Asyncify
+
+- [docs/debugging/DEBUG.md](debugging/DEBUG.md) — debugging guide: Asyncify stalls vs crashes, shim/codegen coupling, stub-bisection
+- [docs/debugging/learning.md](debugging/learning.md) — Asyncify + consecutive modal dialogs: the lock pattern
+- [docs/research/threading_1.md](research/threading_1.md) — deep dive: the Asyncify single-slot `currData` collision bug and the fix
+- [docs/research/threading_2.md](research/threading_2.md) — external research: JSPI/WasmFX/state-machine alternatives, QEMU analysis
+
+## Architecture
+
+- [wasm/README.md](../wasm/README.md) — WASM compatibility layer structure
+- [web/README.md](../web/README.md) — web app (create/open KiCad projects), tech stack, URL routing, WASM artifact serving
+
+## Testing
+
+- [tests/README.md](../tests/README.md) — Playwright test infrastructure, element registry, logs, screenshots
+- [tests/WHATWORKS.md](../tests/WHATWORKS.md) — wxWidgets-in-WASM feature coverage matrix and KiCad readiness
+- [tests/GL_README.md](../tests/GL_README.md) — Emscripten legacy GL immediate-mode quirks (color-per-vertex)
+- [tests/gal-regression/README.md](../tests/gal-regression/README.md) — GAL visual regression suite (native OpenGL vs WebGL WASM)
+
+## Feature design docs
+
+Per-feature design notes and porting records live under [`features/`](features/):
+
+- [web-init](features/web-init/) — web app spec
+- [schematic](features/schematic/) — eeschema WASM bring-up
+- [symbol-editor](features/symbol-editor/) — symbol editor (eeschema kiface launcher)
+- [gerbview](features/gerbview/) — Gerber viewer port
+- [pl-editor](features/pl-editor/) — page-layout editor port (incl. file-dialog usability fixes)
+- [browser-tools](features/browser-tools/) — tool-activation / coroutine deep dives
+- [fix-asyncify-O2-and-modal-promise-rejection](features/fix-asyncify-O2-and-modal-promise-rejection/) — RTree wasm overflow bug investigation
+
+### Archived / historical
+
+[`features/archive/`](features/archive/) holds docs whose work is done or superseded
+(each carries a status banner):
+
+- [webgl](features/archive/webgl/) — WebGL-GAL strategy/plan (since implemented in `kicad/common/gal/webgl/`)
+- [ipc-api](features/archive/ipc-api/) — IPC-API guard cleanup TODO (revert not yet actioned)