🐛 ADR Enforcer creates new comment on every review instead of updating in-place

[sodre]

Summary

The Claude ADR Enforcer GitHub workflow creates a new comment for every PR synchronize event instead of updating the existing comment in-place. This leads to comment spam on PRs with multiple commits.

Current Behavior

Each time a PR is updated (synchronize event), the workflow posts a new comment with ADR review results.

Expected Behavior

1. Summary comments: Should find and update an existing bot comment (identified by a marker like <!-- adr-enforcer -->) rather than creating a new one
2. Inline review comments: Need to investigate whether these can be updated or if a new review submission is required by the GitHub API

Investigation Needed

• Check GitHub API for updating PR review comments vs creating new reviews
• Determine if inline comments can be updated or must be resubmitted
• Look at how other bots (codecov, dependabot) handle this pattern

Acceptance Criteria

• Summary comment is updated in-place on subsequent runs
• No duplicate comments from the enforcer on a single PR
• Inline review behavior is documented (update vs new review)