perf(mobile): preserve cache and dispose replaced development runtimes

[rynfar]

Mobile development cleared Metro’s transform cache on every start and replaced foundational runtimes without disposing their resources. Keep the cache for normal starts, provide an explicit reset command, and replace the connection layer through a stable development atom runtime. The Uniwind patch skips invalidating unchanged generated styles.

Ports the development lifecycle slice of upstream #8694, 1f8ed54add4133ac39effceded8fc1fff12d8e03 (DEF-8). Environment scopes inherit the registry scope so interrupted startup cannot leave a session alive. Pylon schemes and fingerprint runtime policy stay intact. Product navigation, long-press menus, native menu patches, and icon loading are outside this slice.

Validation: 26 focused runtime, stylesheet-refresh, and registry tests pass; mobile and client-runtime typechecks and scoped lint pass. Dependency installation applies the patch. No physical-device build or OTA has been published.

Built and launched an ad-hoc signed iOS development client against disposable Pylon state. Metro served the current source, and native home, thread, review, and file preview views rendered after source restoration. Runtime disposal and unchanged-style refresh behavior are covered by the focused development tests; no physical-device or OTA update was performed.

Before	After

Native navigation and file preview clip.

Model: GPT-6 Astra. Harness: Codex.

[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	13.8 KiB	13.8 KiB	+6 B (+0.0%)	15.1 KiB	✅
Codex	Thread snapshot wire	7.1 KiB	7.1 KiB	−4 B (−0.1%)	7.3 KiB	✅
Codex	Live turn WebSocket wire	6.7 KiB	6.7 KiB	+10 B (+0.1%)	7.8 KiB	✅
Codex	Live turn WebSocket decoded	57.4 KiB	57.4 KiB	0 B (0.0%)	66.4 KiB	✅
Codex	Live turn messages	10	10	0 (0.0%)	21	✅
Claude	Total thread wire	13.8 KiB	13.8 KiB	+74 B (+0.5%)	15.1 KiB	✅
Claude	Thread snapshot wire	7.1 KiB	7.1 KiB	+13 B (+0.2%)	7.3 KiB	✅
Claude	Live turn WebSocket wire	6.7 KiB	6.7 KiB	+61 B (+0.9%)	7.8 KiB	✅
Claude	Live turn WebSocket decoded	58.1 KiB	58.2 KiB	+88 B (+0.1%)	66.4 KiB	✅
Claude	Live turn messages	8	10	+2 (+25.0%)	21	✅

Baseline: 16c999a · PR result: 8226cbf · 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: 111.2 KiB
• Claude decoded thread snapshot: 111.9 KiB

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