docs: fix spec drift in server.md/layout.md and a stale test comment

[dormouse-bot]

Nightly code-quality survey turned up several spots where reference docs had drifted from the code. All changes are documentation-only — no behavior changes.

docs/specs/server.md — sequence diagrams named frames that don't exist in the wire contract

The Pairing and Connect diagrams (and one prose sentence) used frame names that appear nowhere in server-lib-common/src/remote/wire.ts. The relay union defines pair / connect / connect2 / challenge / decision / pair-result; the diagrams referenced pair-request, connect-request, challenge-request, and session-established, none of which exist. A reader implementing against the wire would grep for these and find nothing.

• pair-request → pair (the frame carrying PairingRequest), in both the diagram and the following sentence.
• connect-request {hostId} → connect {hostId} (client→server) and challenge-request → connect {clientId} (server→host, which is what prompts the host to issue the challenge).
• session-established → decision (the real server→client frame — matching the decision already shown on the host→server hop).

docs/specs/layout.md

• Spatial navigation section referenced lath.neighborOf; the actual call is lath.store.neighborOf (Wall.tsx line 375 — neighborOf is a store method, there is no lath.neighborOf).
• The Stage 4 workspaces note pointed at "corner case Custom-rendered app bar #10"; the Corner cases list is numbered 1–6. The "always one visible pane" behavior it cites is the auto-spawn refill — corner case UI improvements #5.

lib/src/lib/terminal-prompt-shape.test.ts

Reworded a garbled comment on the cmd.exe test — the previous text ("The trailing 'run' looks like…") referenced a "run" that doesn't appear in the test inputs. Now describes the actual case: at the drive root the tail :\> could be mistaken for the terminator, but the stable terminator across both paths is >.

pnpm lint:specs (spec-lint) passes. No code paths change, so there is nothing new to test; the test edit is a comment-only reword.

Surfaced by the nightly code-quality survey.

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