feat: reconcile native runtime and Activity integration with dev

[lidge-jun]

Summary

Runnable cumulative native-runtime / Activity integration candidate, based on dev after #541 and #542. Draft: not ready for final merge.

• Integrates Grok ACP, optional persistent Claude SDK, Pi typed finality, durable Activity/print compatibility, and web/Manager/TUI consumers with their later ownership and cleanup fixes.
• Reconciles the already-landed ACP setup-failure fixes through a normal two-parent merge; no history rewrite or wholesale donor replacement.
• Preserves current integrated production behavior. The initial reconciliation merge changed two regression-test files: conditional trace closure and immediate Cursor/Grok steer termination at the exit barrier. The latest normal-descendant update also replaces stale runtime-settings/error source-shape assertions with behavioral oracles and adds bounded projection-lookup coverage.
• Preserves legacy transport choices and Slack final-response/ACK/queue contracts.

This PR's dev-to-head diff is cumulative, not a small test-only feature claim. Original donor PRs #543, #544, #545, #546, #547, #548 and #550 remain open while their assertion/path coverage and review dispositions are reconciled; this PR does not claim every donor is fully superseded.

Initial reconciliation verification (36eb07591)

• 351 tests passed across 20 explicitly selected runtime/trace/transport/request files, including 28 shared ACP setup/cleanup tests.
• npm run typecheck
• npm run build --ignore-scripts
• npm run build:frontend
• bash scripts/verify-dist-assets.sh
• bash structure/verify-counts.sh: 538 entries passed.
• Clean candidate checkout; both integration and current dev heads are actual ancestors.

Tests ran serially with isolated homes and bounded process cleanup. No full local repository suite or real-provider/Slack interaction was performed. An initial test-launch attempt hit macOS IPC socket-path length before tests began; shortening the task-owned temporary prefix fixed the harness, and the complete named run passed. Existing frontend theme-boot/chunk-size warnings remain.

Remaining gates / follow-up layers

Baseline repair update (d15b1c037)

The baseline descendant at d15b1c037 includes the reviewed three-test-file repair from 7725ae600: CSR006/012 now exercise actual settings/session ownership with distinct database sentinels and restoration; EG007's obsolete source window is replaced by the existing, freshly executed EG007a/b print/Copilot error-reentry oracles; three projection-lookup cases guard allocation, recording failure and the item bound. No production code changed in that update.

Freshly passed 76 tests /7 named files on this exact head: cli-switch-refresh, enoent-guard, runtime-projection-lookup, print-spawn-journal, print-bypass-paths, web-settings-runtime-ownership and codex-runtime-projection. New-head CI is tracked separately. This addresses the three known CSR/EG failures, not all remaining Web/docs CI failures. The repair belongs in this lower layer and is normally merged upward into #552; no force-push or rebase.

Final-rendering / hydration baseline update (106ab9f8d)

Source ba49d7470 is included as one three-test-file unit: real finalizer dispatch coverage, six widget types through first-user/history/recycling entrypoints, and removal only of the obsolete elicitation callback assignment-spelling check. All 15 existing elicitation cases remain. Its real first-user/history behavioral replacements are delivered together, not deletion alone. No production change.

Fresh 29 tests /3 files passed on this lower head. The same unit is propagated normally into #552 and #553. Remaining unrelated CI failures still need their own reconciliations; no blanket green claim.

• Virtual transcript DOM/focus-order reconciliation and donor regression/Windows CI reconciliation.
• Scope-appropriate independent review and exact-head hosted CI (tracked after publication).
• Final integrated Electron Computer Use QA after relevant follow-ups; earlier smoke evidence does not certify this final candidate.
• Final donor disposition and bottom-up integration decisions. No automatic merge, branch deletion, release or deployment is requested.

Further runnable changes will be published as ordinary dependent PR layers; this is not a new GitHub native stack.

Rendering and bootstrap repair update (9712b3d)

Includes the reviewed Node A repair from 916653397: behavioral badge/final-render proofs, actual Mermaid callback dispatch, settings-failure/location ordering and AST-verified API counts. These repairs are present in lower #551 and propagated normally; the required existing replacement tests are retained there. Each layer freshly passed 60 tests across six named files after that update.

Also includes the reviewed Node B repair from be4f5b3b: observable reconnect/history/sidebar readiness, declared HTTP ledgers and an actually-started stale-A request. Model-free/cache/request-bridge repairs start in #551; the newer redirect fixture is repaired only in its existing #554 layer and descendants. No new test is introduced into an earlier layer merely to apply a patch.

Fresh bootstrap verification at this head: 61 tests /6 files passed. The test-only repairs preserve production code, process policy and Windows selection. Exact-head hosted Node/Windows results remain mandatory; previous Windows successes are not relabeled as new-head CI. No whole-suite local run, force-push, rebase, skip or approval bypass.

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[lidge-jun]

Accessibility, visual polish and cross-runtime verification handoff

Verified that all seven scoped checkpoints are ancestors of this PR head 36eb075916ad76bee099c28fc47a671fff06eb4a:

• 329b1ebd7: stateful composer accessible names
• fed06b1e2: Pi modal visibility, keyboard containment and focus restoration
• 48daa301f: narrow header/search/Trace layout containment
• 7ce874329: Pi typed finality and owned lifecycle settlement
• ad30739e1: Pi registration response metadata preservation
• 6adcab80e: configured-policy readout separate from editor drafts
• 5efff43fc: Stop/delivery contracts and repeated resource cleanup tests

At the integration checkpoint 5efff43fc, 836 tests across 47 explicitly selected files passed, together with server/frontend types, builds, asset checks and architecture counts. Independent review covered the six final test files; its fixture-cleanup finding was repaired and independently rechecked. Controlled browser fixtures exercised keyboard/focus, light/dark narrow layouts, metadata and policy readouts.

These results are checkpoint evidence, not a claim of final-head CI or live-provider certification. This PR head additionally changes native-cursor-setup-errors.test.ts and trace-store.test.ts; its own verification remains the PR owner’s responsibility. Hosted CI is still pending/in progress at this check. Final Electron QA and TUI follow-ups remain with the existing owner. No real Slack delivery, release, deployment or merge is claimed.

All scoped changes are already included here, so no duplicate PR is needed.