[01] Expose @ankhorage/paradox as Ankh docs command provider

[artiphishle]

Goal

Expose the existing paradox documentation generator through the Ankh provider interface.

Target commands

ankh docs
ankh docs check
ankh docs write

bunx @ankhorage/paradox

The standalone paradox CLI should keep working. ankh docs should delegate to the same implementation.

Package metadata

Add package.json.ankh metadata:

{
  "ankh": {
    "category": "docs",
    "provider": "./dist/ankh.provider.js",
    "capabilities": [
      "docs.generate",
      "docs.check"
    ]
  }
}

Scope

• Add provider metadata and provider entrypoint.
• Reuse existing docs generation logic.
• Avoid making paradox depend on @ankhorage/ankh internals.

Acceptance criteria

• ankh docs can be registered by provider discovery.
• Existing paradox CLI remains compatible.
• Tests cover provider descriptors and command execution path.

[artiphishle]

Related: #58. That PR covers package-level surface metadata only. This issue remains open for the executable docs provider entrypoint, docs command descriptors, and command execution tests.

[artiphishle]

Completed through #58, #60, and #62.

Final released state:

• package surface metadata added
• docs command surface exposed for discovery
• docs.generate / docs.check capabilities declared
• docs handlers added in Add docs surface handlers #62
• released as @ankhorage/paradox@0.1.14

Closing this as completed.