refactor: replace Maestro compat with typed direct engine

[thymikee]

Summary

Replace the production Maestro YAML lowering/replay trampoline with a source-preserving typed program, immutable replay plan, and direct runtime port.

The new engine owns Maestro control flow, variables, target policy, assertions, and lifecycle semantics while reusing shared agent-device gesture and platform backends. The old SessionAction conversion, private __maestro commands, positional decoding, hidden caches, recursive dispatch, and runtime fallback were removed. Android snapshots now fail closed on missing, invalid, stale, or system-chrome-only helper output; persistent-to-command-scoped fallback remains within the same bundled helper contract and never invokes the legacy snapshot engine.

Validation

• Android API 36 Pixel 9 Pro XL: react-native-pager-view 9/9 in 430.4s; react-navigation 38/38 in 493.3s. Snapshot evidence reported android-helper 0.19.3 with persistent-session transport.
• iOS 26.2 simulator: react-navigation 38/38 in 814.6s.
• iOS 26.2 simulator: react-native-pager-view 4/9. All five remaining failures reproduce unchanged with upstream Maestro 2.5.1 on the freshly rebuilt app, including the suite cleanup label mismatch; no agent-device-only divergence remains.
• Static gates: format, lint, typecheck, layering, fallow, metadata generation, build, provider integration, coverage, Android helper build, and Apple runner build passed. The aggregate affected run hit host-load timeouts in five unrelated files; the isolated rerun passed 187/187.

[github-actions]

PR Preview Action v1.8.1
🚀 View preview at https://callstack.github.io/agent-device/pr-preview/pr-1217/
Built to branch gh-pages at 2026-07-14 06:25 UTC. Preview will be ready when the GitHub Pages deployment is complete.

[github-actions]

Size Report

Metric	Base	Current	Diff
JS raw	1.7 MB	1.7 MB	+18.8 kB
JS gzip	542.7 kB	547.3 kB	+4.6 kB
npm tarball	653.4 kB	658.5 kB	+5.2 kB
npm unpacked	2.3 MB	2.3 MB	+20.2 kB

Startup median (7 runs, lower is better):

Scenario	Base	Current	Diff
CLI --version	27.6 ms	27.6 ms	+0.0 ms
CLI --help	58.5 ms	58.9 ms	+0.3 ms

Top changed chunks:

Chunk	Raw diff	Gzip diff
dist/src/session.js	+22.0 kB	+6.0 kB
dist/src/sdk-selectors.js	+15.9 kB	+5.4 kB
dist/src/internal/daemon.js	+2.9 kB	+886 B
dist/src/registry.js	+1.5 kB	+540 B
dist/src/tv-remote.js	-816 B	-417 B

[thymikee]

CI blocks review on 7352d329:

• Fallow reports new production-unused exports: MAESTRO_NEW_ISSUE_URL and pointFromPercentInFrame.
• Provider integration and coverage fail broadly because the bundled Android snapshot-helper artifact is missing; Maestro, Android lifecycle, find, and related scenarios then fail through the real helper-required path.
• iOS smoke fails testSinglePointerFlingFallsBackToXCTestCoordinateDragWhenPrivateSynthesisFails: all expected fallback metadata is nil, so the changed routing is not exercising the asserted fallback.

These are branch failures requiring owner action, not a readiness review. Please address them and update the head; review should resume only after the relevant checks pass.