fix: improve android fill verification diagnostics

[thymikee]

Summary

Improve Android fill verification diagnostics for IME-captured input and masked password fields.

Details:

• Detect when typed text lands in a keyboard/IME-owned input instead of the target app field and report target/actual input metadata.
• Fail fast once verification shows IME capture instead of trying alternate text injection strategies against the wrong focused field.
• Treat matching-length masked/password values as successful verification, with a defensive non-empty expected/actual guard.
• Add a shared fill diagnostics helper for targetInput/actualInput, masked redaction, inferred password-node sensitivity, and expected/actual length metadata so other platforms can adopt the same contract.
• Redact masked/password expected and node text from failure diagnostics while reporting lengths and textRedacted metadata.
• Parse Android hierarchy package and password attributes for fill diagnostics, and tighten Android IME ownership detection to input-method package/resource prefixes.
• Extract Android fill verification into a focused module so input-actions remains the action orchestrator.
• Add versioned help and SkillGym guidance so agents stop retrying fill/type when diagnostics show Gboard handwriting/stylus capture.
• Add an Agent Device Tester fixture on the Checkout form with stable android-ime-capture-fixture and field-ime-capture-target IDs, and point the SkillGym case at that fixture.

Touched files: 11. Scope stayed within Android input verification, shared fill diagnostics, CLI help guidance, Agent Device Tester fixture coverage, and focused tests.

Validation

• pnpm format
• pnpm exec oxfmt --write examples/test-app/src/lab-state.tsx examples/test-app/src/screens/FormScreen.tsx
• pnpm exec vitest run src/platforms/android/__tests__/index.test.ts
• pnpm exec vitest run src/platforms/__tests__/fill-diagnostics.test.ts src/platforms/android/__tests__/input-actions-fill.test.ts src/platforms/android/__tests__/index.test.ts
• pnpm exec vitest run src/utils/__tests__/args.test.ts
• pnpm check:fallow --base origin/main
• pnpm build
• pnpm check:quick
• pnpm test-app:install
• pnpm --dir examples/test-app typecheck
• pnpm exec skillgym run ./test/skillgym/suites/agent-device-smoke-suite.ts --config ./test/skillgym/skillgym.config.ts --case android-fill-ime-capture-stop-retry-loop --runner codex-mini

Known gap: full all-runner SkillGym invocation could not run here because the configured claude runner binary is missing from PATH (spawn claude ENOENT).

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