handoff: the player rules learned the hard way, and the dev-first lane for player changes

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01K6897PWcUEwHiqZMcVnNF6

HANDOFF.md

@@ -58,6 +58,23 @@ do. Read ARCHITECTURE.md first.
 - One static page, no build step, no framework, no keys in the page.
 - STORAGE.md's contract (chai's DB adapter targets it).
 
+## Player rules (each one cost a regression on the phone; don't relearn them)
+
+- **Player changes go to `dev` first** (dev.gandora.lol), get tapped through on an iPhone, then merge to `main`.
+  Anything touching `startNow / toHolding / toPlaying / bed / crackleOn / prime / setSource` counts. Features that
+  don't touch the player (modes, DJ sheet, stats, covers) may go straight to main.
+- Run `sh tools/harness.sh safari` as well as the Chrome modes: WebKit is the iPhone's engine (play() policy, one
+  audio session) and the Chrome loop mode currently hangs on hb-5.
+- iOS ignores `audio.volume`. A level is baked into the sample (`makeCrackle(seconds, gain)`), never set on the element.
+- Never set `state.playing = true` before `play()` resolves. The flag follows the promise (`playNow`); a refusal shows
+  TAP TO PLAY. Setting it early gives a "playing" UI with no sound and a play button that needs two taps.
+- Only one `<audio>` carries the station. A second element (previews) can interrupt the first on iOS; after one
+  plays, expect the next `play()` on the main element to be refused and handled by TAP TO PLAY.
+- The hold between tracks must keep `ended` firing: hold on a real looping clip with its own URL (silence when room
+  tone is OFF), never on `SILENCE`, which the `ended` handler ignores.
+- The crackle bed is Web Audio and must never start over the music: `bedStart` refuses while the phase is playing and
+  the element is playing or a play() is pending.
+
 ## What's next (agreed directions, not started)
 
 - Text embeddings for every sheet, audio embeddings (Gemini Embedding 2) for kept/reacted tracks; the taste map