feat(authoring): report compatibility and static readiness

[777genius]

Adds explicit client compatibility, engine capabilities and static source-project doctor commands through both internal authoring entrypoints. Compatibility uses the existing client registry without installed clients; doctor uses captured metadata and leaves executable versions, dependency consistency, runtime and OAuth unproven.

Follows merged #157. Based on main at e92f409. This is Phase 4, not the Phase 6 public cutover; default v1 builds stay unchanged.

Validation at 783ab8d (tree identical to tested 3cc9dcc):

• Authoring, factory and planner suites passed after rebasing onto the first PR fixes.
• Both actual native binaries passed compatibility/capabilities/doctor E2E. Added commands ran under a calibrated Linux Landlock/seccomp fixture that denies network, child execution, HOME file access and source writes while allowing private reader scratch. This proves denial, not a trace of every attempted access.
• Independent review found one P2 involving empty MCP server names. The correction separates item identities from document-wide invalidity; baseline-failing regressions now pass through compat and inspect at both mounts. Post-commit planner/commands and confined native checks passed. Earlier focused/race/vet and CLI regression checks also passed.
• Final required CI, CodeQL, security checks, documentation checks and Linux/Windows installer smoke passed on this head. The draft CodeRabbit check is a skip, not independent review evidence.

The bounded diff includes the pure compatibility API and tests. Native platform support, Skills authoring and release packaging remain separate gates. Revert this PR independently to remove these read-only commands while retaining #157.

[coderabbitai]

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