Delete the hidden renderer skip grammar

[nwparker]

Summary

Phase 6 — the deletion the architecture earned. Net −1,284 lines.

With the model owning hidden content (delivery gate), side effects (facts channel), and queries (model responder), the renderer's per-chunk hidden classification has no remaining purpose:

• hidden-renderer-skip-eligibility.ts and its tests deleted; every skip/scan path in pty-connection.ts removed (the eligibility grammar, DEC-2026 hidden classification state, split-boundary scans, mode-2031 byte scanning, skip-latch semantics)
• the 10s codex startup query window deleted; codex spawns are now hidden-marked from byte zero and the model responder answers their startup probes (end-to-end pinned)
• the hidden data path is now three lines of policy: foreground → write; restore latched → reconcile; otherwise → background queue (2 MB lossy cap → restore marker → snapshot restore) — which is also the complete kill-switch-off fallback, pinned by a new test
• hidden-output-restore machinery fully retained (it is the reveal reconciliation for the gate and the overflow path)
• kept deliberately: the parked 2031 byte sidecar (sole answerer for switch-off parked tabs — per-mode audit documented in its header)

E2E contract updates

Pressure scenarios retitled from "skips renderer writes" to "withholds renderer delivery"; structurally-zero skip-counter assertions removed (main's hiddenDeliveryDroppedChars is the load-bearing withheld-output signal); the rich-model 11s delay deleted (existed only for the startup window); long-table and visual-restore specs trimmed of dead debug fields.

Validation

• typecheck clean; oxlint clean
• 2,377 unit tests green (74-file renderer sweep + 83-file main sweep); 14 grammar tests deleted, 5 reworked to overflow-driven restore, new fallback-chain and codex-spawn pins added
• e2e: 17 visual/parking/memory/attention/sleep-wake + 6 pressure + golden 2/2 on fresh builds

Cut-off

Independently mergeable; completes Phases 5–6. Phase 7 (final benchmark matrix + over-time report) follows.

Made with Orca 🐋

[stage-review]

Ready to review this PR? Stage has broken it down into 7 individual chapters for you:

	Title
1	Update terminal query authority documentation
2	Delete the hidden renderer skip grammar
3	Remove skip grammar logic from pty-connection
4	Update PTY spawn and lifecycle handlers
5	Clean up debug counters and E2E state
6	Refactor pty-connection unit tests
7	Update E2E pressure and restore specs

_{Chapters generated by Stage for commit 4f2ee31 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 model/view chain into current main and then added newer scheduler, producer flow-control, snapshot, and reliability work. This old component/rollup branch no longer has an independent delta to rebase.