style: establish an Agent Trace dprint baseline

[NWYLZW]

Establish a reproducible dprint baseline for Agent Trace so subsequent formatting checks can run against consistently formatted maintained files. The first commit normalizes 14 source, test, and documentation files; the second adds dprint 0.57.1, pinned TypeScript/JSON/Markdown plugins, local format commands, and a standalone formatting CI job.

Import and export declaration order is explicitly preserved, and JSX keeps the repository's double-quote convention. Security manifests and their recorded digests retain their exact main-branch bytes and are excluded from formatting. Existing product dependency declarations and all existing non-root lock entries remain unchanged. Runtime behavior, public contracts, permissions, and Session identity are preserved.

Validation on the final tree:

• npm run format:check: passed.
• npm run check: typecheck, build, and all 27 tests passed. The same gate also passed public naming and npm pack --dry-run.
• Original module declaration order and security artifact bytes were checked against main.
• git diff --check: passed.

ESLint and shared line-limit configuration remain work for the next phase.

No package publication, preview operation, or Mono pointer change is included.