Add blood decals, gore, mobile HUD, web start gate + touch/perf tests

Remove tools/fstest.html scratch page used to probe browser
fullscreen/orientation APIs.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EznnY8rH2dXhtono1kwsXg

CLAUDE.md

@@ -33,7 +33,11 @@ I am a **Godot 4.6+ expert**. I follow current best practices for GDScript, scen
 | `levels/MapScreen.tscn` / `levels/map_screen.gd` | Between-fights map screen; win → pick a node → next level |
 | `crowd_marker.gd` | `CrowdMarker` (`@tool Node3D`, `class_name`) — designer drops one per billboard spectator via the editor's Add-Node dialog; picks one of six 60°-spaced facings from the `orientation` dropdown. Draws an editor-only preview (slab + forward arrow, never serialised) and joins the `&"crowd_marker"` group |
 | `crowd_billboards.gd` / `crowd_billboard.gdshader` | `MultiMeshInstance3D` that harvests every `CrowdMarker` (group `&"crowd_marker"`) into one draw call, using each marker's world position + chosen facing. Front/back sprite sheet baked by `tools/bake_crowd_sheet.gd`; falls back to a generated inward-facing ring when no markers are placed |
-| `debug_params.gd` | Runtime-tunable parameter registry (autoload `DP`) |
+| `debug_params.gd` | Runtime-tunable parameter registry (autoload `DP`). Mobile-relevant flags: `force_touch_controls`, `touch_debug` (also enabled on-device with `?debug=1` in the page URL — shows the live profiler overlay in `touch_controls.gd`), and `use_rigid_skin` (default **off** — native GPU skinning everywhere now that the 4.7 web templates fixed the Mali/ANGLE invisible-skinning bug; `rigid_skin.gd` is a retained opt-in fallback). Rigid-skin is gated through `Controls.rigid_skin_enabled()`, which a page URL param overrides for on-device A/B with no console: `?skin=1` forces the workaround on (for a device where native skinning still fails), `?noskin=1` forces native off. Turning the workaround off also removes its per-spawn SurfaceTool rebuild, which was the arena's matador-spawn lag |
+| `touch_controls.gd` | On-screen thumb UI for touch/web (`CanvasLayer`, instanced by `hud.gd`, self-gating on `Controls.use_touch_ui()`): a floating left-side joystick feeding the `move_*` actions + a right-side ability cluster, drawn/hit-tested in one IGNORE-filtered Control from raw `_input()`. The joystick self-heals — the latest left-zone touch re-acquires it (`_stick_index`), and a relayout / focus-out / vanished touch resets state so a dropped touchend can't strand a stuck stick. Ability buttons use grown hit-rects + a press flash. `_draw_debug()` (gated on `Controls.debug_overlay()` — DP `touch_debug` or `?debug=1`) is a live on-device profiler reading Godot's `Performance` monitors: FPS/frame-ms with a bottleneck verdict, `process`(main-thread GDScript) vs `physics`(ragdoll/Jolt) ms with 2 s peak-hold, draw calls/objects/primitives, node count, render resolution, and `crossOriginIsolated` — so a lag spike is pinned to CPU-script vs CPU-physics vs GPU-fill instead of guessed |
+| `web_start_gate.gd` | Autoload `WebStartGate` — "TAP TO PLAY" panel shown on web+touch before play; the tap drives `Controls.request_fullscreen_landscape()` so the fullscreen/orientation churn happens with no in-flight touch to lose. Re-armable: polls browser fullscreen state and returns if the player leaves it (iPhone Safari can't fullscreen, so it stops nagging once a request never takes) |
+| `mobile_hud.gd` | Mobile-only health readouts (`CanvasLayer`, instanced by `hud.gd` only on touch): big bull pip row top-left + a Souls-style bear boss bar top-centre (discovered via group `&"bear"`, tracks `health_changed`). The desktop bottom pip cluster is hidden on touch |
+| `orientation_guard.gd` | Autoload `OrientationGuard` — full-screen "rotate your device" prompt shown on touch devices while portrait |
 | `Assets/` | Raw 3D assets (`.glb`, `.fbx`) |
 | `Blender/` | Blender source files, animation scripts, FBX exports |
 | `Blender/create_matador_anims.py` | Creates walk + idle animations and exports FBX |
@@ -105,8 +109,11 @@ bash run_tests.sh
 gdlint *.gd levels/*.gd tests/*.gd                                # GDScript lint (gdtoolkit, installed via uv)
 godot --headless --script tests/logic_test.gd         # pure logic, ~2 s
 godot --headless --script tests/performance_test.gd   # frame-budget regression guard, ~4 s
+godot --headless --script tests/ragdoll_perf_test.gd  # on-hit spike breakdown: ragdoll build / sim-start / blood / mass hit, ~90 s
 godot --headless --script tests/gameplay_test.gd      # full scene, bone sanity, ~4 s
 godot --headless --script tests/level_switch_test.gd  # no arena geometry leaks into the bear level, ~2 s
+godot --headless --script tests/touch_controls_test.gd # joystick self-heals: relayout/focus-out/vanished-touch never strand a stuck stick, ~2 s
+godot --headless --script tests/rigid_skin_test.gd    # web mesh conversion keeps every material (no bald / recoloured matadors), ~2 s
 godot --headless --script tests/bear_boss_test.gd     # bear boss moveset: routines, leap landing, hyper-armour, ~10 s
 godot --headless --script tests/bear_fx_test.gd       # bear attack-FX: each Bear_FX clip pops its mesh + self-hides, ~2 s
 godot --headless --script tests/bear_hitbox_test.gd   # bear attack colliders: leap launches everywhere (ring_frac slider) + smash lane travel, ~3 s