fix(mobile): wait for deep-link thread hydration

[rynfar]

Opening a thread deep link could show "Thread unavailable" while that environment's shell and thread detail were still synchronizing. The route now waits for its own shell/detail state, while deleted threads and sync errors leave loading promptly. A deleted or missing thread returns to the thread list; connection failures can retry the environment; unknown environments open environment settings.

Adapted from T3 commit caf8b5d798909780a7b197cb264e782888b919c1 (#11502). The terminal recovery action is Pylon-specific: reconnecting cannot restore a deleted or missing thread. Existing shell-first thread rendering, drafts, and local/remote environment selection remain intact.

Validation: 7 focused mobile/shared shell tests passed, mobile typecheck and scoped lint passed, and independent source review cleared the final patch. Lint reports pre-existing ThreadRouteScreen warnings. Browser/device verification was not run because AGENTS.md requires explicit approval.

Model: GPT-6 Sol (low). Harness: Codex in Pylon, with GPT-6 root oversight and independent review.

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1 Skipped Deployment

Project	Deployment	Actions	Updated
pylon-marketing	Ignored	Preview	Sep 24, 2026 8:41am UTC

[github-actions]

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	14.0 KiB	14.0 KiB	−16 B (−0.1%)	15.1 KiB	✅
Codex	Thread snapshot wire	7.2 KiB	7.2 KiB	+7 B (+0.1%)	7.3 KiB	✅
Codex	Live turn WebSocket wire	6.8 KiB	6.7 KiB	−23 B (−0.3%)	7.8 KiB	✅
Codex	Live turn WebSocket decoded	58.0 KiB	58.0 KiB	−44 B (−0.1%)	66.4 KiB	✅
Codex	Live turn messages	10	9	−1 (−10.0%)	21	✅
Claude	Total thread wire	14.0 KiB	14.0 KiB	+10 B (+0.1%)	15.1 KiB	✅
Claude	Thread snapshot wire	7.2 KiB	7.2 KiB	−10 B (−0.1%)	7.3 KiB	✅
Claude	Live turn WebSocket wire	6.7 KiB	6.8 KiB	+20 B (+0.3%)	7.8 KiB	✅
Claude	Live turn WebSocket decoded	58.9 KiB	58.9 KiB	0 B (0.0%)	66.4 KiB	✅
Claude	Live turn messages	10	10	0 (0.0%)	21	✅

Baseline: 7ed3f71 · PR result: 745fe8f · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

• Codex decoded thread snapshot: 115.6 KiB
• Claude decoded thread snapshot: 116.3 KiB

Updated in place by a trusted workflow. PR artifacts are strictly validated and never executed.