docs: fix stale references after dockview/migration/quit refactors

[dormouse-bot]

Nightly survey found four spots where docs and a code comment describe behavior the recent refactors (#230, #231, #232, #234) already changed. All fixes are documentation/comment-only — no behavior change — so no regression test applies.

• AGENTS.md — the tiling-engine.md index entry still advertised "Lath-only persistence with a one-way legacy-blob migration reader". Delete old-persistence migration tech-debt #232 deleted that migration reader (and tiling-engine.md's own ## Persistence section was already updated). Dropped the stale clause.
• docs/specs/standalone.md — the Dirty-gated writes section described the structural save trigger as "Structural dockview events" / "with no dockview event". Dockview is gone; the trigger is a Lath store commit (use-session-persistence.ts:133 → lath.store.subscribe(scheduleSessionSave)). Reworded to "Lath store commits" / "no Lath commit". docs: retire dockview references in DESIGN.md after Lath (#228) #231 retired dockview references but missed this occurrence.
• standalone/src/tauri-adapter.ts — requestSessionFlush's comment said it's "Called by the (future) quit orchestrator". The orchestrator (standalone/src/quit.ts) shipped in Standalone quit flow: graceful teardown, durable final save, session-persistence hardening #230 and now calls it. Dropped "(future)".
• docs/specs/dor-cli.md — the dor list --json description listed caller_surface_ref, focused_surface_ref, and the host block, but omitted the top-level workspace_ref / window_ref fields that renderListJson also emits (dor/src/commands/list.ts:164). The command's own help snapshot already documents them; brought the spec prose in line.

pnpm lint:specs passes (23 specs, 24 files).

[cloudflare-workers-and-pages]

Deploying mouseterm with    Cloudflare Pages

Latest commit:	c956a7a
Status:	✅  Deploy successful!
Preview URL:	https://f526c4a2.mouseterm.pages.dev
Branch Preview URL:	https://fix-docs-staleness-post-refa.mouseterm.pages.dev

View logs