v0.8.5 — housekeeping from the audit, and the playtest line retired

The third release from the audit; nothing a player sees changes. CHANGELOG has the detail.

The 0.4.9 playtest line is no longer maintained (Jesse, 2026-09-29): the deploy rule that
existed for it is gone and #85 is moot. The table test (#39 #35 #42a #40) is closed — every
line of the checklist was met at a table. #46 is done and cannot regrow: the 36 unused
declarations are removed and `noUnusedLocals`/`noUnusedParameters` are on; two of them were
dead bot functions from rejected candidates the round said it had deleted. The documents no
longer teach `trainCapSlack` (a knob that throws), point at `as-built.md` (deleted in 0.8.2),
model `officeType` (the engine says `tier`) or describe `collisionOccurred` (never emitted);
the README's account of bot flags now matches the bot's. Five playtest saves committed in
`docs/` against the repository's own rule are in the ignored `playtests/`.

What the audit found and did not fix is written down as TODO #112-#117, each with its reason.
#112 is `docs/plans/structure.md`, the proposal for `http.ts`, `main.ts` and `check`. #117 —
`/api/save` hands a seat the seed mid-game — waits on a conversation.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FrCWubm9GAftYCm2hWdKwK

docs/rules/card-reference.md

@@ -4,9 +4,10 @@
 > 2026-07-30 in `docs/Deck cards2.xlsx`, `Trains3.pdf` and `Mainline Cards.pdf`, and is transcribed
 > in `src/engine/content.ts`. See [`implications.md`](implications.md) for the full comparison.
 >
-> **For what the cards say today, read [`as-built.md`](as-built.md)** — generated from
-> `content.ts` and checked against it by the test suite, so it cannot fall behind the way this file
-> did. For several releases `content.ts` named *this* page as the current reference while the banner
+> **For what the cards say today, read the generated tables in [`home-deck.md`](../home-deck.md)
+> and [`mainline-deck.md`](../mainline-deck.md)** — written by `npm run build:cards` from
+> `content.ts` and checked against it by the test suite, so they cannot fall behind the way this
+> file did. For several releases `content.ts` named *this* page as the current reference while the banner
 > here said otherwise, and a reader following the code landed on the v0.4.5 deck.
 >
 > Kept for the reasoning it records — the economy analysis in §7 was how we knew what questions to