fix(coding-agents): declare the repository so provenance publishing works

The release workflow publishes with `npm publish --provenance`, and npm rejects
the upload when package.json has no `repository` matching the signed provenance:

  422 Unprocessable Entity - Error verifying sigstore provenance bundle:
  "repository.url" is "", expected "https://github.com/vectorize-io/hindsight"

v0.0.1 built and tagged fine and only failed at the registry. Same shape as the
other npm integrations (openclaw, ai-sdk, chat), including `directory` so npm
links to the subfolder.

hindsight-integrations/coding-agents/package.json

@@ -1,6 +1,11 @@
 {
   "name": "@vectorize-io/hindsight-coding-agents",
   "version": "0.0.1",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/vectorize-io/hindsight.git",
+    "directory": "hindsight-integrations/coding-agents"
+  },
   "description": "Reflect-only Hindsight long-term memory for coding agents (harness-pluggable: opencode, …), with automatic background ingestion (no setup CLI).",
   "type": "module",
   "main": "dist/index.js",