Align query authority contract and spawn-time ownership

[nwparker]

Summary

Phase 5 slice 3 — completes the query authority phase (design: docs/reference/terminal-query-authority.md).

• contract alignment: model/view contract invariant 6 replaced with singular structural authority (the model answers exactly the chunks the delivery gate dropped; the daemon session emulator stays write-only forever — session.test.ts assertions untouched, comments updated)
• app-start attribute push: view attributes publish right after settings fetch, before any pane mounts — hidden-at-launch TUIs get color replies from byte one
• mark-at-spawn: panes spawning hidden declare it through the spawn path so main owns queries before the first byte (daemon sessions marked pre-spawn via the up-front session id); codex spawns keep delivery for their startup window; spawn failure unmarks. End-to-end test: a hidden-at-spawn PTY answers DA1 on its first chunk
• kitty re-seed parity: kittyKeyboardFlags now applied when re-seeding runtime emulators from daemon snapshots (as an unflagged write — replay-guard semantics intact), so hidden ? u probes report real flags after relaunch
• daemon shell-ready reply queueing verified (queues, never drops; bounded by ready marker or 15s) and documented at the responder write site

Validation

• typecheck clean; oxlint clean; 13 new tests, 2,936 green across renderer/ipc/runtime/daemon sweeps
• e2e: hidden TUI visual restore 4/4, parking 3/3, attention + golden 2/2

Cut-off

Independently mergeable; Phase 5 complete. Phase 6 (deleting the hidden-skip grammar and the codex startup window) now has every prerequisite in place.

Made with Orca 🐋

[stage-review]

Ready to review this PR? Stage has broken it down into 6 individual chapters for you:

	Title
1	Codify singular structural query authority
2	Push view attributes at app start
3	Implement kitty keyboard flag re-seed parity
4	Wire initiallyHidden flag through IPC
5	Declare hidden-at-spawn in the renderer
6	Handle hidden-at-spawn in main process

_{Chapters generated by Stage for commit 7cbd354 on Jun 17, 2026 10:14am UTC.}

[nwparker]

Closing as superseded by merged PR #7214 (merge e84a8dd), which explicitly revived the complete term-speed-2 chain into current main and added newer scheduler, flow-control, snapshot, and reliability work.