docs(01-10): install-flow + auto-select research — both asks INFEASIBLE

Researcher (gsd-phase-researcher) returned HIGH-confidence verdicts on the
12-area brief from .continue-here.md:

Ask 1 (install-time auto-start): INFEASIBLE in unmanaged Chrome.
  W3C Screen Capture spec §5.1 mandates transient user activation;
  chrome.runtime.onInstalled confers none. Floor: 2 clicks
  (toolbar/welcome-page → Share button on picker). Enterprise policy
  ScreenCaptureWithoutGestureAllowedForOrigins exists (Chrome+Edge ≥ 123)
  but only applies to managed-Chrome contexts with extension URL
  whitelisted — does NOT apply to Load-Unpacked deployment; deferred-idea.

Ask 2 (auto-select desktop / skip picker): INFEASIBLE in unmanaged Chrome.
  W3C spec mandates user MUST choose every time. displaySurface:'monitor'
  is a hint (already applied src/offscreen/recorder.ts:270).
  chooseDesktopMedia doesn't auto-accept on single-monitor setups AND
  streamId not usable in MV3 offscreen documents (Chrome DevRel position).

Primary recommendation: KEEP Plan 01-10's current informational CTA
charter (commit 3a530c2 unchanged). Both architectures hit the same
2-click floor; informational CTA has lower maintenance surface AND
teaches operator where the toolbar icon lives (critical for day-2+
sessions).

Enhancement candidate (NOT required for 01-10): add
monitorTypeSurfaces:'include' (Chrome ≥ 119) to offscreen getDisplayMedia
constraints — single line, zero risk, removes tab/window panes from
picker entirely. Suggest as Plan 01-09 amendment OR mini-plan.

Open questions for orchestrator (3):
1. Confirm informational CTA charter (this research recommends YES)
2. Ship monitorTypeSurfaces:'include' as Plan 01-09 amendment vs deferred?
3. Are Repremium operators on Wayland Linux? (affects welcome-page copy)

File: .planning/phases/01-stabilize-video-pipeline/01-10-RESEARCH.md
  (1092 lines; full W3C citations, Chromium issue links, prior art for
  Loom/Screencastify/Veed/Awesome-Screenshot, ASCII flow diagrams,
  edge-case enumeration for macOS/Wayland/incognito/managed-Chrome)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.planning/STATE.md

@@ -3,8 +3,8 @@ gsd_state_version: 1.0
 milestone: v2.0.0
 milestone_name: milestone
 status: executing
-stopped_at: Session resumed 2026-05-19 post-/gsd-pause-work; spawning install-flow + auto-select researcher (the 529-blocked workstream); remaining Phase 1 gates after researcher = Plan 01-10 executor + Plan 01-12 executor + final-closure marker flip
-last_updated: "2026-05-19T16:05:00Z"
+stopped_at: Install-flow researcher returned 2026-05-19 (01-10-RESEARCH.md, 1092 lines); HIGH-confidence verdicts — both operator asks INFEASIBLE in unmanaged Chrome per W3C Screen Capture spec §5.1; recommendation = keep Plan 01-10's informational CTA charter; enhancement candidate = `monitorTypeSurfaces:'include'` for Plan 01-09 amendment. Awaiting orchestrator decision on 3 open questions before spawning 01-10 + 01-12 executors.
+last_updated: "2026-05-19T16:30:00Z"
 last_activity: 2026-05-19
 progress:
   total_phases: 5