feat: add mobile harness strategy modes

[Harzva]

Summary

This PR promotes the Mobile Harness strategy layer to release-readiness for non-counted app-side dry traces.

It is non-counted strategy release-readiness, not a formal benchmark result. All dry trace outputs remain gated with counts_as_experiment=false / non-counted status, and real provider/tool/device callback promotion remains blocked until explicit evidence requirements are met.

What Changed

• Added the strategy ablation schema, registry, scaffold/pilot run artifacts, validators, and documentation.
• Added app-side strategy services and runners:
  • StrategyDispatcher
  • strategy_runners.dart
  • memory packet bridge via memory_packet_service.dart
• Added StrategyModeCard to the Home Tools page for:
  • Auto
  • ReAct
  • Plan-Execute-Verify
  • Supervisor/Handoff
  • Experimental Swarm
• Added Android emulator QA evidence for the strategy UI dry trace flow.

Android Emulator QA

Android emulator QA passed for the latest release APK.

• Evidence directory: docs/mobile-harness-benchmark/strategy-ablation/evidence/android-strategy-qa-20260620/
• APK SHA256 is recorded in apk-sha256.txt.
• install.txt records Success.
• launch.txt records Status: ok for com.mobilecode.app/.MainActivity.
• Details screenshots/XML are included for Auto, ReAct, PEV, Supervisor/Handoff, and Experimental Swarm.
• App-scoped logcat evidence contains no FATAL EXCEPTION, E/flutter, ANR, or MissingPluginException.

CI / Local Verification

• Mobile Runtime CI: success
  • https://github.com/Harzva/mobilecode/actions/runs/27873174593
• flutter test test/services/ test/widgets/strategy_mode_card_test.dart: 307 passed
• flutter analyze lib/widgets/strategy_mode_card.dart: No issues found
• python3 -m py_compile scripts/run_mobile_harness_strategy_ablation.py scripts/validate_mobile_harness_strategy_ablation.py scripts/generate_mobile_harness_strategy_callback_pilot.py: passed
• Strategy validators for r1-scaffold and p4c-callback-pilot: passed
• git diff --check: passed
• High-confidence secret/private-path scan: clean
• README/GitHub Pages link check: 16/16 returned 200

Review Focus

Please focus review on:

• mobile_agent/lib/services/strategy_dispatcher.dart
• mobile_agent/lib/services/strategy_runners.dart
• mobile_agent/lib/services/memory_packet_service.dart
• mobile_agent/lib/widgets/strategy_mode_card.dart
• docs/mobile-harness-benchmark/strategy-ablation/release-readiness-2026-06-20.md
• docs/mobile-harness-benchmark/strategy-ablation/evidence/android-strategy-qa-20260620/

Merge Checklist

Before merge, confirm:

• PR checks are green.
• No secrets, private paths, raw transcripts, cookies, or .env values are included.
• counts_as_experiment=false and non-counted strategy boundaries are preserved.
• Experimental Swarm remains feature-gated and reports experimental_strategy_disabled unless explicitly enabled in a later phase.

After Merge

After merge, release/tag or GitHub Pages/README link updates should be handled as a separate release step.

Not Included

The local worktree still contains unrelated dirty/untracked work that is intentionally not included here, including local model runtime work, architecture assets, zip review packs, and snake workspace files.