fix(m13): audit Phase 2 — game-feel correctness (F-03/04/13/14/15/19/40/41)

[ksdisch]

Audit Phase 2 — ship the juice that was built

Implements §Phase 2 of docs/AUDIT-2026-07-09.md (game-feel correctness). Branched off main per Kyle's call; drafts #23/#24 rebase over this (only overlap is one pointerdown hook in Hub.ts).

Fixes

• F-04 effects.ts — explode()'s x/y args are emitter-local in Phaser ≥3.60 and the emitter already sits at world (x,y); dropping them un-doubles the coords. Every particle burst was rendering off-screen since M5; they're visible for the first time.
• F-03 Enemy.ts — freeze re-cast now extends the freeze via a freezeToken guard (mirrors phaseToken); previously the first cast's timer un-froze mid-window. No pure helper extracted: the logic is two lines of Phaser-timer interplay, covered live (below) rather than by a contrived mock.
• F-13 Planet.ts — castPower() ignores casts landing after the win (no banners/cues/platforms over the end card; lastCastPower untouched).
• F-14 Planet.ts — showWin() hides the hazard curtain (depth 40) + unrevealed dark zone (depth 50) instead of raising the card: the card must stay below the depth-60 win burst that F-04 just made visible.
• F-15 Planet.ts — link indicator + net wiring now exist only in co-op; solo (never connected) no longer shows a green "phone linked".
• F-19 Planet.ts — a platform re-cast while one is alive flashes PLATFORM HOLDS! instead of being swallowed silently (mirrors illuminate's banner-only re-cast).
• F-40 Hub.ts/music.ts — one-time pointerdown → resumeMusic(); first hub visit ran startMusic with no gesture in the call stack, so the context could sit suspended (silent hub). MusicSink gains resume(), mirroring the SFX sink.
• F-41 music.ts — the master GainNode is now disconnected (delayed past fade/note tails) on track switch; previously one leaked per switch.

Gate (all green)

• typecheck clean · 177/177 Vitest (+2 resumeMusic dispatch tests) · smoke:relay passes
• Headless bridge playbook: planet-1 full run (boot, clean slate, clear, omit-freeze 7 respawns, omit-platform 3 pit respawns, illuminate flip, reload durability, juice cues/bursts, shake-on-death) · planet-2 clear · planet-3 clear with phase negative (maxX pinned 560 at the curtain, 5 respawns) + positive (phaseActive, crossed, 0 respawns)
• F-03 regression: cast @t0 + re-cast @t1.5s → still frozen @t3.5s (past the old timer), released @t4.9s; single-cast expiry unchanged
• F-13 probe: post-win phase-dash/summon-platform casts changed nothing
• Screenshot pass (the blind spot that shipped F-04): freeze burst visible on the frozen sentry; Nebula Core end card clean of curtain stripes; PLATFORM HOLDS! banner captured
• F-40 note: headless Chromium autoplay is always-running, so the resume is asserted via unit tests + error-free Hub boot; it's a best-effort no-op when nothing is suspended.

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