Fix small follow-ups after the strict TypeScript port (TSF5)

[Finesssee]

Small fixes left over from the strict TypeScript port. This is a behavior PR, not a port PR: each behavior change has a test that failed before the fix and passes after it, plus a doc line.

Items

#	Item	Status
1	Session cookie read at a name boundary	Done. session() was already anchored. The real bug was /auth/logout, which matched mini_session= anywhere in the header, so xmini_session=<hex> signed out the wrong session. Both now use one sessionCookie() in server/auth.ts.
2	botDropText prototype keys	Done. DROP_TEXT is a Map, so constructor reads as constructor instead of function Object() { [native code] } (constructor).
3	/auth/* errors escape the Worker's catch	Done. return await handleAuth(...) inside the try, so a throwing AuthStore gets the 503 Service unavailable; check owner diagnostics answer instead of a rejected fetch.
4	Demo overlay warns on extension messages	Done. parseDemoMessage returns null for a message without a demoPaused field, and the overlay ignores it silently. A demoPaused that isn't a boolean still warns once.
5	Profile save reports "Not saved" when a 2xx answer is unreadable	Done. New acceptedUnreadable(r) in src/parse.ts. The fighter page says "Your profile may have saved, but this page couldn't read the answer. Reload the page to check."
6	Stale comments	Done. overlay.ts (the ?v= hash comment now names vite.config.ts servedBuild), upload.ts (vite.config.ts, src/admin.ts), cosmetics.ts (tests/cosmetics.test.ts). Comment-only changes to served code change the served hash once.
7	port-check NON_SHIPPING misses vite.config.ts	Done. The rule now matches vite.config.(js|ts), which matches what DEVELOPMENT.md and CONTRACTS.md already say.
8	Make shape() specs exhaustive over T	Skipped. A mapped { readonly [K in keyof T]-?: Check } spec fails tsc in two places (STATE_CONFIG is annotated Spec, and LogRow.context?: unknown has no check). Fixing it needs a new always-pass check in the page bundle, which is more than a few lines and changes how every spec is written.
9	Vacuous test assertions	Done. channel.test.ts (alarm ?? 0) <= x is now must(alarm) <= x at five sites, so an unset alarm fails. The registry test's Twitch stub answers /helix/moderation/moderators with {data: []} explicitly. I confirmed the call is made: naming the viewer a mod there flips "a renamed Twitch name..."

Red, then green

The pre-commit hook runs bun run check, so the failing runs aren't in history. These are from the working tree before each fix.

Unit (bun run test:unit, before the fixes: 364 run, 360 pass, 4 fail):

not ok 32 - sign-out reads only the cookie named mini_session, not one that ends in it
  error: the real session is gone
not ok 33 - an auth route that throws gets the Worker's error answer, not a rejected fetch
  error: 'auth store down'
    handleAuth (server/auth.ts:275:20)
    async Object.fetch (server/worker.ts:454:15)
not ok 355 - chat bot: drop reasons read as words
  + 'function Object() { [native code] } (constructor)'
  - 'constructor'
tests/browser-parse.test.ts failed to load:
  SyntaxError: The requested module '../src/parse.ts' does not provide an export named 'acceptedUnreadable'

Item 4, the old parseDemoMessage on messages an extension might post:

"hello" -> {"ok":false,"error":"demo message has no demoPaused switch"}
{"source":"react-devtools-content-script"} -> {"ok":false,"error":"demo message has no demoPaused switch"}
null -> {"ok":false,"error":"demo message has no demoPaused switch"}
[true] -> {"ok":false,"error":"demo message has no demoPaused switch"}

Item 7, the new port-check test against the old NON_SHIPPING rule:

not ok - vite.config.ts may update a string naming a ported file, like vite.config.js
  +     'vite.config.ts differs (base line 1, head line 1)\n' +
  +     '  base: export const SERVED = ["src/ui.js"];\n' +
  +     '  head: export const SERVED = ["src/ui.ts"];\n' +
  +     '2 files compared, 1 different\n'
  -     '2 files compared, 0 different\n'

Tests

• Unit: 371 before, 374 after, all passing. The new tests are two in tests/auth.test.ts (items 1 and 3) and one in tests/browser-parse.test.ts (acceptedUnreadable, item 5). Items 2 and 4 add assertions to existing tests in tests/worker.test.ts and tests/browser-parse.test.ts.
• Port tools (bun run test:port, run by CI): 101 before, 102 after.
• Not checked: the profile-save message (item 5) has a unit test for acceptedUnreadable only. The dashboard wiring has no automated test, and CI doesn't run test:ui. I couldn't open a browser for this PR, so someone should check the message on staging.

Docs

• docs/CONTRACTS.md §1: only a cookie named exactly mini_session counts, and /auth/* errors get the 503 answer. The bot status section says unknown drop reasons read as themselves. §8 covers parseDemoMessage returning null and acceptedUnreadable.
• docs/PAGES.md /?channel=: the "may have saved" message.

Follow-ups (not in this PR)

• handle() in server/worker.ts has more unawaited returns inside the same try as item 3: return internal(...) (about 8 sites) and return refuseSave(...) (3 sites). internal calls a Durable Object fetch that can reject. Turning on @typescript-eslint/return-await with in-try-catch would catch all of them.
• The shop purchase path on the fighter page has the same unreadable-2xx problem as item 5.

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