refactor: extract host process primitives

[thymikee]

Summary

Extract shared host process primitives after the managed web browser cleanup landed.

Move daemon identity and takeover checks into a daemon-owned module, keep browser/runner/app-log/trace cleanup policy at the call sites, and migrate matching callers/tests away from process-identity.ts.

Validation

• pnpm format
• node ./node_modules/oxfmt/bin/oxfmt --check scripts/clean-daemon.ts
• pnpm check:quick
• pnpm build
• pnpm test:smoke
• pnpm check:fallow --base origin/main
• focused migrated Vitest coverage for host-process, daemon-process, web lifecycle, trace cleanup, runner adoption/session, daemon/client metro paths
• pnpm check:unit full-suite reruns hit the existing Apple status-bar timing/contention failure in src/platforms/apple/core/__tests__/index.test.ts; that file passed in isolation with 96 tests

[github-actions]

Size Report

Metric	Base	Current	Diff
JS raw	1.5 MB	1.5 MB	+106 B
JS gzip	495.9 kB	496.1 kB	+127 B
npm tarball	591.7 kB	591.9 kB	+247 B
npm unpacked	2.1 MB	2.1 MB	+106 B

Startup median (7 runs, lower is better):

Scenario	Base	Current	Diff
CLI --version	27.1 ms	26.3 ms	-0.8 ms
CLI --help	49.9 ms	50.2 ms	+0.4 ms

Top changed chunks:

Chunk	Raw diff	Gzip diff
dist/src/record-trace-recording.js	-119 B	-41 B
dist/src/runner-client.js	-15 B	+3 B
dist/src/client.js	-4 B	-3 B
dist/src/internal/daemon.js	-4 B	-2 B

[github-actions]

PR Preview Action v1.8.1
Preview removed because the pull request was closed.
2026-07-06 17:02 UTC