feat(sim): Right axis = deterministic real-time painterly dream

Replace the pre-baked SD restyle variants (too fluid — the painting re-rolled
every keyframe and the flow-warp melted frames) with a deterministic, real-time
dream that holds STILL across the loop; only the footage's own motion moves.
Design: docs/superpowers/specs/2026-06-22-right-axis-deterministic-dream-design.md

Engine (player/alteration.py): Restyle(variant) -> Dream(strength, intensity);
Calibration.right_variant_map -> dream_gain. player/state.py: a Right change is a
LIVE_UPDATE now, not a crossfade (only a clip swap crossfades). Plan dict
restyle -> dream. Tests migrated; 233 green. (No new Python behavior for the
client-render swap below.)

Renderer (simulator front-end): the Right dream is a WebGL2 Kuwahara shader on a
<canvas> over the live video — edge-preserving, so motion/structure stay crisp;
the dream is the same footage, just stylized (no blur). Ramped by the knob; max
goes "trippy" (vivid saturation + ~45deg hue drift + posterize, concentrated near
max via t=intensity^2). Phase-1 luminous-haze (CSS+bloom) was built then retired
by eye (blur read as out-of-focus video). Mood grade rides as a CSS filter on the
canvas; bloom layer removed.

Dev ergonomics that fell out of the iteration:
- /dev/version + a 1s client poll = live-reload (open tab never runs stale
  renderer code; reloads on my edits AND server restarts).
- no-cache on the dev server; an on-screen error banner + crash-proof render so a
  silent throw can't masquerade as "nothing is changing".

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

simulator/app.py

@@ -7,6 +7,9 @@ endpoints (/api/select, /api/catalog/meta) and the X-ray are retired.
 
 from __future__ import annotations
 
+import hashlib
+import os
+import time
 from pathlib import Path
 from typing import Optional
 
@@ -30,6 +33,24 @@ STATIC_DIR = Path(__file__).parent / "static"
 MEDIA_DIR = Path(__file__).parent / "sample_media"
 DEFAULT_MANIFEST = MEDIA_DIR / "manifest.json"
 
+# Per-process boot token: changes on every server restart so the dev live-reload
+# (below) also fires when Python code changes (which needs a restart), not just
+# when a static asset's mtime changes.
+_BOOT_ID = f"{os.getpid()}-{int(time.time())}"
+
+
+def _asset_version() -> str:
+    """A short digest of the renderer assets' mtimes + this process's boot token.
+    Changes whenever app.js/style.css/index.html change on disk OR the server is
+    restarted — the signal the browser polls to know it's running stale code."""
+    parts = [_BOOT_ID]
+    for name in ("app.js", "style.css", "index.html"):
+        try:
+            parts.append(f"{name}:{(STATIC_DIR / name).stat().st_mtime_ns}")
+        except OSError:
+            parts.append(f"{name}:?")
+    return hashlib.sha1("|".join(parts).encode()).hexdigest()[:16]
+
 
 class ControlsModel(BaseModel):
     content: str
@@ -44,7 +65,7 @@ class ControlsModel(BaseModel):
 class CalibrationModel(BaseModel):
     mood_gain: float = 1.0
     overlay_gain: float = 1.0
-    right_variant_map: list[int] = [0, 1, 2, 3, 4]
+    dream_gain: float = 1.0
 
 
 class AlterationRequest(BaseModel):
@@ -86,7 +107,7 @@ def create_app(manifest_path: Optional[Path] = None) -> FastAPI:
             Calibration(
                 mood_gain=req.calibration.mood_gain,
                 overlay_gain=req.calibration.overlay_gain,
-                right_variant_map=tuple(req.calibration.right_variant_map),
+                dream_gain=req.calibration.dream_gain,
             )
             if req.calibration
             else DEFAULT_CALIBRATION
@@ -98,6 +119,12 @@ def create_app(manifest_path: Optional[Path] = None) -> FastAPI:
             "content": {"audio_source": content.audio_source, "video": content.video},
         }
 
+    @app.get("/dev/version")
+    def dev_version():
+        # Dev live-reload signal: the browser polls this and reloads when it
+        # changes, so it never silently runs a stale renderer during iteration.
+        return {"version": _asset_version()}
+
     @app.get("/api/clips")
     def api_clips():
         return {"clips": [c.to_dict() for c in app.state.clips]}