docs(skills): drive omitted iOS rows with touch

[rynfar]

Problem

The mobile testing skill said React Native rows omitted from XcodeBuildMCP's standard target summary could not be driven. A real iOS verification showed that verbose snapshots still expose these rows with current element references and touch actions.

Fix

Document the proven fallback: inspect verbose snapshot elements, match the intended row by label and frame, require a touch action, send down and up events, and refresh before the next action. Registered deep links remain the fallback when no matching element exposes touch.

Verification

• vp fmt --check .agents/skills/test-pylon-mobile/SKILL.md
• git diff --check
• Reproduced during PR feat(providers): add Oh My Pi Early Access support #82 iOS verification with project and environment rows omitted from standard targets

Implemented by OpenAI GPT-5.6 (xhigh) with the Prime Agent harness.

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[github-actions]

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

ℹ️ The exact PR base did not have a successful artifact. Baseline uses the latest successful main measurement shown below.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	13.3 KiB	13.3 KiB	−9 B (−0.1%)	15.1 KiB	✅
Codex	Thread snapshot wire	6.9 KiB	6.9 KiB	−7 B (−0.1%)	7.3 KiB	✅
Codex	Live turn WebSocket wire	6.4 KiB	6.4 KiB	−2 B (−0.0%)	7.8 KiB	✅
Codex	Live turn WebSocket decoded	55.5 KiB	55.5 KiB	0 B (0.0%)	66.4 KiB	✅
Codex	Live turn messages	9	9	0 (0.0%)	21	✅
Claude	Total thread wire	13.3 KiB	13.3 KiB	−11 B (−0.1%)	15.1 KiB	✅
Claude	Thread snapshot wire	6.9 KiB	6.9 KiB	0 B (0.0%)	7.3 KiB	✅
Claude	Live turn WebSocket wire	6.4 KiB	6.4 KiB	−11 B (−0.2%)	7.8 KiB	✅
Claude	Live turn WebSocket decoded	56.3 KiB	56.3 KiB	0 B (0.0%)	66.4 KiB	✅
Claude	Live turn messages	9	9	0 (0.0%)	21	✅

Baseline: 9c87381 · PR result: 2f2954e · 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: 109.4 KiB
• Claude decoded thread snapshot: 110.0 KiB

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