chore: keep classifier schemas out of package

[dutifulbob]

Summary

Removes the workflow-specific PR classifier schema from localagent.
Localagent should stay generic and accept any schema path; the actual classifier schema belongs in the clawd workspace.

What Changed

• Deleted schemas/pr-local-model-classifier.schema.json from localagent.
• Removed schemas/** from package files.
• Changed README/docs examples back to generic ./schema.json paths.

Testing

• npm run check
• Validated the real PR 80568 classifier flow using /home/bob/clawd/schemas/pr-local-model-classifier.schema.json and jq assertions for the new shape.

Risks

Low. This removes a bundled example schema only; localagent's generic --final-schema feature is unchanged.

[dutifulbob]

Final report:

• Removed the workflow-specific PR classifier schema from localagent.
• Removed schemas/** from the package files.
• Changed localagent docs/examples back to generic ./schema.json paths.
• The actual classifier schema now lives in the clawd workspace at ~/clawd/schemas/pr-local-model-classifier.schema.json.

Validation:

• npm run check passed.
• GitHub Actions ci / test passed.
• Real smoke using /home/bob/clawd/schemas/pr-local-model-classifier.schema.json passed against PR 80568 and verified the output has interest but no relevance, evidence, or metadata.