Workstation film-stage density under committed band extents

Context

Surfaced by the #17863 dense-tour repair at its design boundary. Since #17857 removed the workstation's 1280px-era band caps (restoring edge-resize agency), the boot bands render their committed document extents proportionally at every size: at the film stage (2560×1440) the left band is now ~507px (20%), right ~634px (25%), bottom ~335px (25%) — where the tuned dense look was ~260/320/200 under the old caps.

The Problem

The dense-composition design intent — guarded by WorkstationNL.spec.mjs's density leg (heavyWidth ≥ 700, band literals at :793-795 and :1042, evidence-card proportions) — was authored against quasi-fixed band pixels. Under proportional extents the center row keeps ~1340px at 2560 and the heavy tab panel computes to ~534px: the "dense living center" the film frames genuinely shrinks. This is a product decision, not a spec defect:

1. Re-tune initialDocument's edge extents for the film look (e.g. left ~0.13, right ~0.16, bottom ~0.17 — floors keep small viewports sane; the user can still drag to 50%). One-line-per-zone change in apps/workstation/tour/denseWorkstation.mjs; the tour's own workspace: {2560×1440} stage then reproduces the designed density.
2. Accept the proportional look and re-derive the density leg's expectations (the film reframes).
3. Workstation re-caps via fluid maxima (e.g. max(16.25rem, 25cqi)) — keeps growth agency while bounding boot width; partially reverts #17857's simplification.

Option 1 preserves both the film design and the resize agency; recommended.

Decision (2026-08-30)

Option 1 selected, with live-derived extents 0.11 / 0.14 / 0.17 (left / right / bottom). The ticket's approximate 0.13 / 0.16 / 0.17 candidate restored the heavy pane but still left the 100k grid's final header 41.859px outside its toolbar at the 2560×1440 stage. Tightening the horizontal pair to 0.11 / 0.14 yields roughly 279 / 355px bands — close to the prior 260 / 320 composition, preserves the wider evidence band, and satisfies both independent center-density guards. Bottom remains 0.17 (roughly 228px).

The Fix

Adjust only initialDocument's three edge extents and the two owning whitebox surfaces. WorkstationResidentCardSizingNL receives the focused film-stage contract: worker-owned document extents must agree with rendered band geometry, the heavy resident group remains at least 700px wide, and the scale headers fit with bounded trailing space. WorkstationNL keeps its broader geometry expectations current and advances beyond the density leg. Its independent late-tour regressions have separate durable owners: #17871 for midpoint-scroll grid continuity and #17872 for the Security FLIP-stage recurrence.

Acceptance Criteria

• A decided film-stage density: re-tuned boot extents 0.11 / 0.14 / 0.17, derived from the live 2560×1440 falsifiers above.
• The focused WorkstationResidentCardSizingNL film-stage witness is green, with density intents intact; WorkstationNL advances beyond every band/splitter/density assertion without weakening them. Post-density grid/FLIP choreography is explicitly transferred to #17871 and #17872.
• #17863's WorkstationNL deferred-evidence annotation resolved by the delivering PR.

Out of Scope

• Engine/theme bounds (settled by #17857 + its review).
• The tour's mechanical layers except the remaining same-genus first-match/count sites exposed only after the density gate moved; those witness-only corrections fold here so the residual test can reach its owning assertions.
• Midpoint-scroll grid continuity (#17871) and the Security fixed-stage recurrence (#17872). Both occur after the density contract passes; neither is fixed or waived here.

Related

• #17863 (parent lane; deferred-evidence source), #13158 (epic parent), #17857 / PR #17858 (the agency change), #15252 (the film these frames serve), #17871 and #17872 (post-density regression owners)

Origin Session ID: c98e1ede-1a32-46f3-90ef-aaf37def487d Retrieval Hint: "workstation film density committed extents band pixels 2560"