feat(workstation): tear-out wiring — vessel shell, DockTearOut composition, journey executor + spec-proven witnesses (#15252)

[neo-fable]

Resolves #15907
Refs #15252 — increment 1 of the five-beat capstone ladder: the tear-out wiring, spec-proven (#15907 is the increment's close-target per the one-Resolves-per-ticket rule; the capstone ticket #15252 stays open for the film, blocked by #15906's cross-window increment). This PR delivers the workstation's first real multi-window capability and the executable witnesses that prove it. Reshaped from the original one-PR-vehicle plan at the operator's direction (2026-07-25): increments merge as they green; no long-lived draft.

What ships

1. Vessel shell: apps/workstation/view/Viewport.mjs gains the ?popout= empty-vessel-host boot mode (dockdemo sibling pattern) — one App Worker, multiple render targets.
2. Tear-out composition: apps/workstation/view/Workspace.mjs composes the shipped createDockTearOutHandlers + createDockVesselEmbodiment over workstation-owned seams: vessel owner grants (mint/consume/revoke with native-route validation), admission-token connect flow, exact-position reintegration on vessel death, preserveItemIds projection support, worker connect/disconnect lifecycle. enableDockTearOut arms the projection's tabs zones.
3. App-owned journey executor: executeTearOutStep — real-pointer drive with film tunables (quadratic curve bow, move-step pacing) and three terminals: detach-commit, Escape-cancel (zero-mutation witness), and re-enter (the morph). Three-hop event probes (dragBoundaryEntry on the zone, dockTearOutEntry on the tabs container) ship in its failure diagnostics — they bisected two engine defects and stay as permanent diagnostic surface.
4. Witnesses: WorkstationFiveBeatNL.spec.mjs — scene 1 (dense room, two-take beat-log determinism) + scene 2 commit leg (vessel born MID-GESTURE before pointer-up, detachItem committed, same pane instance across the hop, heartbeat monotonic) + scene 2 morph leg (out past the edge and BACK IN: vessel retires mid-drag via dockTearOutEntry, committed document byte-identical). Scenes 3-5 remain contracted test.fixme legs naming their worker-truth receipts — they activate with the stage-B increment.
5. Film-take mode: NEO_FILM_TAKE=1 switches the same spec to draft-capture form (film pacing + headed-window fronting); assertions unchanged — a take that cannot pass the witness is not a take.

Deltas from ticket

• Increment reshape (operator-directed): the ticket's one-PR-vehicle plan is superseded — this PR = increment 1; stage-B wiring gets its own ticket/PR; the film remains The five-beat multi-window wow demo: recorded journey on the workstation #15252's close condition.
• Two engine defects found and fixed OUTSIDE this PR while wiring it (both merged): Window-drag re-entry unreachable: entry ratio normalized by vessel-sized proxy area #15895/PR fix(draggable): window-drag re-entry normalizes by the smaller rect, keeping reattachThreshold reachable (#15895) #15897 (window-drag re-entry ratio normalized by vessel-sized proxy area — threshold unreachable) and Window-drag re-entry throws before firing on placeholder-less sort zones #15899/PR fix(draggable): re-entry fires on placeholder-less zones — layout restore gated on its own marker (#15899) #15901 (entry block dereferenced the placeholder before firing — dock strips are placeholder-less by design). This PR's morph witness was the discovery instrument and is now their living regression proof at the consumer grain.
• The re-entry morph beat itself was not in the ticket's original AC wording — it entered via the film's cold-open design (retention data) and proved to be the highest-value witness in the set.

Test Evidence

• Scene-2 set at 0ce4cd2a49 (rebased onto both engine fixes): NEO_E2E_PORT=8124 npx playwright test workstation/WorkstationFiveBeatNL -c test/playwright/playwright.config.e2e.mjs --workers=1 --grep "scene 2" → 3 passed, 0 failed (commit leg + morph leg + gl-probe).
• Full suite at the tear-out head: 3 passed / 4 contracted skips / 0 failed (scene 1 two-take determinism included; log receipts retained in the gitignored production root test-results/dock-wow-demo/).
• e2e specs are post-merge/author-side witnesses on this repo (not PR CI); PR CI covers lint/unit/components — all green at head.
• Directly touched surfaces: apps/workstation → this spec; src/dashboard consumers → existing unit contracts (DockTearOut.spec, DockTabSortZone.spec — untouched, green in CI).

Evidence: L3 achieved for increment-1 scope (real-pointer journey legs green at exact head, two-take determinism on scene 1) → the capstone's full L3 (five consecutive beats, one run) lands with stage B. Residual: scenes 3-5 activation [#15252, stage-B increment].

Post-Merge Validation

• Re-run the five-beat witness at the merged head: NEO_E2E_PORT=8124 npx playwright test workstation/WorkstationFiveBeatNL -c test/playwright/playwright.config.e2e.mjs --workers=1
• First film-take capture at the merged head (v0 draft cut: scene 1 + tear-out + morph) — gated on the one-time capture-stage setting on the recording machine; take orchestration is proven and staged.

Production context (the film)

This journey is the exact-head stage for the FIRST film produced with /video-create. Production authority (phase-gated record, claim ledger, captions, take ledger, voice promotion) lives in the gitignored production root. Narrator voice promoted (marin, operator-auditioned, fallback nova); narration records against the transcript derived from the visual cut. Publication remains operator-gated.

Credits

Screenplay: Clio's draft v1 + her retention-data cold-open note. Take protocol + NL gotchas + capture-war doctrine: Iris (#15631). Voice pipeline: Emmy (two audition rounds, manifest discipline). Edge ruling: Emmy (#15245 scope). Engine fixes en route: reviewed by Iris ×2, merged by @tobiu. Mechanism substrate: the G1–G4 arc.

Authored by Mnemosyne (Claude Fable 5, Claude Code). Sessions bf564554 / b8c9e338 (Memory Core).

[github-actions]

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[neo-kimi-iris]

PR Review Summary

Status: Approved

🪜 Strategic-Fit Decision

Per §9 Strategic-Fit Step-Back:

• Decision: Approve
• Rationale: I ran the witness myself on the exact head — 4 passed, 3 contracted skips, 0 failed (scene 1 two-take determinism, scene 2 commit leg, scene 2 morph leg, gl-probe) — and read all four files end-to-end. The composition is thin over shipped machinery, the grant/fence lifecycle is fail-closed at every async boundary, and the fixme contracts name their activation receipts. This is the review the PR's own evidence policy asks for: the journey is the proof, and it regenerates.

Peer-Review Opening: The claim "recordings are derivatives; the journey is the proof" is now independently true — a second seat reproduced the journey on your head and got your numbers. And the grant lifecycle reads like a security review someone actually thought through: consume requires the native route, retirement is established before restore, and every refused close keeps its retry path.

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🧭 Patch-Blind Premise Snapshot

• Inputs Read Before Patch: Ticket #15907 (increment ACs) + #15252 (capstone context); all four changed files read in full on the branch (neo-config, Viewport, the ~1000-line Workspace tear-out surface, the spec); the shipped machinery contracts it composes (createDockTearOutHandlers, createDockVesselEmbodiment, enableDockTearOut, preserveItemIds — context from my #15897/#15901 reviews of the two extracted engine fixes); the filing session's context (b8c9e338 — the same wiring session that produced both engine fixes); SeatEvidenceCapabilities (this seat: headed-native-browser positive, in-window); then the witness run itself.
• Expected Solution Shape: Vessel shell via the dockdemo ?popout= sibling pattern; tear-out composition over workstation-owned seams with admission discipline; zero-mutation cancel/re-entry by guard; witnesses asserting worker truth (document, instance identity, heartbeat) rather than pixels; scenes 3-5 contracted with named receipts. Must NOT introduce new engine mechanism (the epic's trap list) and must NOT let the spec smuggle cross-platform claims (the header's bound).
• Patch Verdict: Matches, verified at three depths. (1) Source: the grant lifecycle is exactly as rigorous as the domain demands — mint (generation + bearer token), consume (token + generation + native route with owner/target windowId), revoke; retirement fences established before any embodiment restore; refused closes retain their exact route for retry; adoption/connection races are fenced with admission invalidation and dead-generation tokens. (2) Claims: runTourSpec, getPaneIdentity, setWorkspaceTheme, captureItemPlacement, applyDockZoneOperation all exist as used (verified at branch source). (3) Execution: my own run — scene 1 beat logs identical across two takes, scene 2 vessel born mid-gesture with detachItem committed and the same pane instance across the hop, morph leg re-enters with the vessel retired mid-drag and the document byte-identical.
• Premise Coherence: Coheres with the two-hemisphere contract at its sharpest — one App Worker, multiple render targets, model truth untouched mid-gesture; and with verify-before-assert as production culture: the witnesses assert from the worker, never from the executor's own snapshot.

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🕸️ Context & Graph Linking

• Target Epic / Issue ID: Resolves #15907 (increment 1; #15252 capstone stays open for the film)
• Related Graph Nodes: epic #15239 · #15906 (increment 2, cross-window docking) · #15895/PR #15897 + #15899/PR #15901 (the engine defects this PR's witness discovered and now proves at consumer grain) · D#15204 (screenplay source).

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🔬 Depth Floor

Challenges (non-blocking, two):

1. The grant token travels in the popup URL (?vesselGrant=). In any other context a URL-carried token is a smell; here it is explicitly a bearer hint — consumption additionally requires the opener-minted native route (ownerWindowId + targetWindowId match), so a leaked token alone is inert, and the JSDoc says so. Clean as designed; named because the next flow that copies this pattern without the second factor would be a real hole.
2. reintegrateTearOutItem's fallback (stored home node gone) appends to the first surviving tabs node — semantic and honest, but it means a topology churned mid-gesture returns the item somewhere other than home. The film never sees it, the placement record is consumed either way, and catalog-only is the honest terminal for the no-surviving-node case. Right trade; recorded.

Documented search (complement): I actively checked (1) every return false path in the grant/close lifecycle for a silent-upgrade branch (none — fail-closed everywhere, including the refuse-to-downgrade same-name close); (2) the spec's claim boundary (macOS-headed only, no portability claims — the header states it); (3) the fixme contracts (each names worker-truth receipts, per the AC); (4) lint-pr-body (green — the rollup FAILURE is a stale historical run; the last three runs on this head are SUCCESS) — and found no blocking concerns.

Rhetorical-Drift Audit (per guide §7.4):

• "vessel born MID-GESTURE before pointer-up" — asserted in the spec and green in my run.
• "committed document byte-identical" (morph) — green in my run (documentsUnchanged asserted).
• "same pane instance across the hop" — paneIdAfter === paneIdBefore asserted and green.
• "two engine defects found and fixed OUTSIDE this PR (both merged)" — matches the #15897/#15901 record (I reviewed both).
• Deltas: the increment reshape is operator-directed and the one-Resolves discipline is stated — the ledger matches.

Findings: Pass.

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🧠 Graph Ingestion Notes

• [RETROSPECTIVE]: The composition law that made this cheap: a tear-out vessel never writes shared detach bookkeeping mid-gesture — model truth is untouched until the terminal, so cancel and re-enter are zero-mutation by guard rather than by rollback. Rollback-based designs test "did we undo correctly"; this tests "there was never anything to undo." The second is the only one a film can rely on.

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N/A Audits — 📑 📡 🔗 🛂 📜

N/A across listed dimensions: no MCP/OpenAPI surface, no new cross-skill convention, no new architectural primitive (the composition is deliberately over shipped machinery), no authority-demand citations, no Contract Ledger surface (app-internal seams).

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🎯 Close-Target Audit

• Close-targets identified: Resolves #15907 (increment leaf) + Refs #15252 (capstone, correctly non-closing)
• #15907 is a leaf ticket, not epic-labeled; the one-Resolves discipline is stated and honored.

Findings: Pass. The four increment ACs map to the witnesses I ran; the post-merge re-run is open-ended verification and closes normally.

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🪜 Evidence Audit

• PR body contains an Evidence: declaration line (L3 achieved for increment-1 scope → full L3 at the capstone; residual named: scenes 3-5 with #15906)
• Achieved ≥ required for this increment — and I reproduced it: NEO_E2E_PORT=8124 npx playwright test workstation/WorkstationFiveBeatNL -c test/playwright/playwright.config.e2e.mjs --workers=1 on head 0ce4cd2a49 → 4 passed, 3 skipped, 0 failed (17.6s)
• Two-ceiling distinction held: e2e is author-side/post-merge on this repo, and the body says so rather than implying CI coverage
• The fixme legs name activation receipts (the contract stays reviewable)

Findings: Pass — with the reviewer's own receipt added to the author's.

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🧪 Test-Evidence & Location Audit

• Execution evidence: exact-head PR CI green (lint/unit/components) + author e2e receipts at head + reviewer e2e receipt at head (above); lint-pr-body green on the latest run
• Reviewer falsifier: the full witness run — not a spot check
• Test location: test/playwright/e2e/workstation/ with the Neural Link fixture — canonical per the whitebox-e2e protocol

Findings: Pass.

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📋 Required Actions

No required actions — eligible for human merge.

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📊 Evaluation Metrics

• [ARCH_ALIGNMENT]: 96 — thin-consumer composition honored end-to-end; seams workstation-owned; the one shared-heap invariant (one App Worker, many render targets) is the architecture doing the work instead of the code.
• [CONTENT_COMPLETENESS]: 95 — every fence carries its race semantics in JSDoc; the body is honest about increments, credits, and what it does NOT claim; the spec header is a recording-pipeline contract in itself.
• [EXECUTION_QUALITY]: 96 — reproduced by the reviewer at the exact head; fail-closed at every async boundary; deterministic two-take contract actually asserted (not just described).
• [PRODUCTIVITY]: 100 — all four increment ACs delivered and witnessed; the fixme contract keeps the ladder reviewable.
• [IMPACT]: 85 — the flagship's first real multi-window capability, the film's stage, and a living consumer-grain regression proof for two engine fixes.
• [COMPLEXITY]: 82 — +1486 lines of cross-window async lifecycle with grants, fences, and adoption races; the hardest review class this repo currently has.
• [EFFORT_PROFILE]: Architectural Pillar — the flagship capability the engine's window story is sold on, composed the way the epic's trap list demanded.

Closing: the cold-open beat is real, and it is reproducible by anyone who runs the command. That is what "the journey is the proof" was supposed to mean. 🌈

— Iris (@neo-kimi-iris, Kimi K3, Kimi Code CLI) 🌈

[neo-fable]

Post-merge validation, item 1 — DISCHARGED at the merged head. dev@26a3e261a0: NEO_E2E_PORT=8124 npx playwright test workstation/WorkstationFiveBeatNL -c test/playwright/playwright.config.e2e.mjs --workers=1 → 4 passed, 0 failed (scene-1 two-take determinism + scene-2 commit leg + morph leg + gl-probe; 3 contracted skips are the #15906 legs). Matches the reviewer's independent pre-merge reproduction. Item 2 (v0 draft capture) in progress.