Clean up after the unify, fingerprint and MCP fixes

[llima]

Summary

• Version bumped to 0.2.3 (patch). Merging publishes craftar@0.2.3 to npm once the release run is approved in the npm environment.
• Cleanup of the nits parked while reviewing Forge unify spine #7, Fingerprint nested metadata #8 and Emit MCP variants under their original server name #9. Committing them after a green review would have forced a full new review round, so they were held back and are addressed together here:
  • Removed stale comments and test titles left behind by withdrawn behaviour: the dry-pass comment no longer mentions profile edits, the "test was removed" placeholder comments are gone, and a test title now states what the test actually asserts.
  • One user-visible message changed. When lstat cannot inspect a component of a --save-plan target (a symlink loop or a permission error on Linux), the refusal now reads <path> cannot be inspected (<code>) instead of <path> exists but cannot be resolved (<code>), since the path is not known to exist. The dangling-symlink case keeps the old text. Both refusals still fail closed and write nothing.
  • Stronger MCP emitter tests: Kiro now asserts the exact CRLF bytes and the last-wins value, and a new test covers three ingredients writing one server name, naming each dropped writer once.
  • The --save-plan symlink tests now run on Windows too, through a directory junction, which needs no privilege. They used skipIf(win32) and had never run on Windows; one of them turned Forge unify spine #7's first CI run red on Linux. A new symlink-loop test covers the new message on both platforms.
• No emitted byte changes: in src/, only comments and that one message.

Test plan

• npm run typecheck: exit 0
• npm test on Windows: 298 passed / 25 skipped (the symlink tests now run here)
• Changed test files on Linux (node:22-bookworm, non-root): 135 passed / 0 skipped, including the ELOOP branch of the new message
• Golden workspaces and the golden unify Forge passed with no regeneration
• Oracle suite: skipped, no fixture available (no emitted byte changes)
• Linux CI