Normalize agent-created PRs into Neo4j (M1)

[issuetopr-dev]

Summary

• Introduces first-class PullRequest nodes in Neo4j and ingests them automatically from successful create_pull_request tool results.

What’s included (M1 per issue plan)

• Data model: Added PullRequest node schema in lib/types/db/neo4j.ts with core properties (repoFullName, number, url, title, createdAt, and optional status fields).
• Repository: lib/neo4j/repositories/pullRequest.ts with:
  • upsertPullRequest: de-dupes by (repoFullName, number), sets createdAt on create.
  • linkEventCreatedPR: links Event:Message (toolCallResult) to the PullRequest via [:CREATED_PR].
• Service: lib/neo4j/services/pullRequest.ts with upsertCreatedPullRequestFromToolResult which:
  • Parses/derives repoFullName from PR URL when not provided.
  • Upserts PullRequest and creates the CREATED_PR relationship.
• Ingestion: lib/adapters/PersistingEventBusAdapter.ts now:
  • Persists the tool.result event.
  • On toolName === "create_pull_request" with status === "success", parses the number/url/title and calls the service to upsert the PR and link it.

Design notes

• De-dupe key: (repoFullName, number) enforced via MERGE in upsertPullRequest.
• URL normalization: deriveRepoFullNameFromUrl("https://github.com/owner/repo/pull/123") -> "owner/repo".
• Relationship: (e:Event:Message {type:'toolCallResult', toolName:'create_pull_request'})-[:CREATED_PR]->(pr:PullRequest).

Non-breaking & minimal

• No behavior changes outside tool.result ingestion.
• No dependency updates.

Follow-ups (next milestones)

• Backfill from historical events.
• Scheduled GraphQL status refresher worker in apps/workers/workflow-workers.
• CLI exporter and optional API docs.

Checks

• ESLint (next lint) passes locally.
• Prettier/TS checks are unchanged from baseline repo; no global formatting was applied to avoid unrelated churn.

Closes #1332

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