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>

player/state.py

@@ -3,10 +3,10 @@
 Pure decision logic — no mpv, no audio, no serial. Each update() resolves the
 desired Playback (which neutral base clip, how it is altered, what audio plays,
 at what levels) and returns the Transition from the previous Playback. The
-transition KIND encodes design §4.3: the Dark/Light grade and the Left overlay
-are continuous runtime ops (LIVE_UPDATE), whereas swapping the clip or the
-pre-baked Right restyle variant (a discrete index) needs a CROSSFADE, and
-toggling video on/off fades to/from black.
+transition KIND encodes design §4.3: the Dark/Light grade, the Left overlay AND
+the Right dream (a deterministic, live luminous haze since session 0013) are all
+continuous runtime ops (LIVE_UPDATE); only swapping the clip needs a CROSSFADE,
+and toggling video on/off fades to/from black.
 
 Knobs no longer *select* a clip (the base library is neutral by construction);
 they *transform* it. Which neutral base to show is an injected policy
@@ -107,7 +107,9 @@ class Player:
         if next_video and not prev_video:
             return TransitionKind.FADE_FROM_BLACK
         if next_video and prev_video:
-            if nxt.clip_id != prev.clip_id or nxt.plan.restyle != prev.plan.restyle:
+            # The Right dream is a live filter now (not a substrate swap), so it
+            # no longer forces a crossfade — only a clip (scale) change does.
+            if nxt.clip_id != prev.clip_id:
                 return TransitionKind.CROSSFADE
             return TransitionKind.LIVE_UPDATE
         # both black: only audio/levels could have changed