chore: polish PR review skills

.agents/skills/PR_WORKFLOW.md

@@ -110,7 +110,7 @@ Before any substantive review or prep work, **always rebase the PR branch onto c
 - During `prepare-pr`, use concise, action-oriented subjects **without** PR numbers or thanks; reserve `(#<PR>) thanks @<pr-author>` for the final merge/squash commit.
 - Group related changes; avoid bundling unrelated refactors.
 - Changelog workflow: keep the latest released version at the top (no `Unreleased`); after publishing, bump the version and start a new top section.
-- When working on a PR: add a changelog entry with the PR number and thank the contributor (mandatory in this workflow).
+- When working on a PR: add a changelog entry line with the PR number `(#<PR>)` and `thanks @<pr-author>` when author metadata is available (mandatory in this workflow).
 - When working on an issue: reference the issue in the changelog entry.
 - In this workflow, changelog is always required even for internal/test-only changes.
 

.agents/skills/merge-pr/SKILL.md

@@ -41,11 +41,12 @@ scripts/pr-merge <PR>
 scripts/pr-merge run <PR>
 ```
 
-3. Ensure output reports:
+3. Capture and report these values in a human-readable summary (not raw `key=value` lines):
 
-- `merge_sha=<sha>`
-- `merge_author_email=<email>`
-- `comment_url=<url>`
+- Merge commit SHA
+- Merge author email
+- Merge completion comment URL
+- PR URL
 
 ## Steps
 
@@ -97,3 +98,4 @@ Cleanup is handled by `run` after merge success.
 
 - End in `MERGED`, never `CLOSED`.
 - Cleanup only after confirmed merge.
+- In final chat output, use labeled lines or bullets; do not paste raw wrapper diagnostics unless debugging.

.agents/skills/prepare-pr/SKILL.md

@@ -74,6 +74,11 @@ jq -r '.changelog' .local/review.json
 jq -r '.docs' .local/review.json
 ```
 
+Changelog gate requirement:
+
+- `CHANGELOG.md` must include a newly added changelog entry line.
+- When PR author metadata is available, that same changelog entry line must include `(#<PR>) thanks @<pr-author>`.
+
 4. Commit scoped changes
 
 Use concise, action-oriented subject lines without PR numbers/thanks. The final merge/squash commit is the only place we include PR numbers and contributor thanks.