docs: the file map after the split, the globals brain.js and the harness use, and the harness modes as they are now

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Dhu3iHseRewQ2WpBSVLokG

tools/split-globals.txt

@@ -2,4 +2,4 @@
    and the exact names brain.js uses today, as globals. Everything else stays inside the modules. */
 window.g = { state, openStation, cookNext, crackle, hooks, db, wavBlob, $, hash32, render: { setFetcher } };
 Object.assign(window, { state, hooks, $, db, playJob, drawCover, hash32, prng, keyHue, KEYS, reactionWeight, drawTaste, openTaste, reactionEmoji });
-Object.defineProperty(window, "seq", { get: () => ids.seq, set: (v) => { ids.seq = v; } });   // brain.js does ++seq
+Object.defineProperty(window, "seq", { get: () => ids.seq, set: (v) => { ids.seq = v; } });   // brain.js increments the job counter as a global