docs(learning-hub): add /pr auto, /pr automerge, and /chronicle skills review (#2168)

Document three new CLI commands from Copilot CLI v1.0.66 (2026-06-30):

- /pr auto: self-paced loop that fixes one failing item per run and
  paces around CI to drive a PR to green
- /pr automerge: extends /pr auto to continue until the PR is fully
  merged (CI passes, reviews approved, PR merged)
- /chronicle skills review: interactive review flow for agent-proposed
  draft skill changes (accept, reject, or defer each draft)

Changes:
- copilot-configuration-basics.md: add /pr auto + /pr automerge section
  in CLI Session Commands, extend /chronicle section with skills review
  subcommand
- creating-effective-skills.md: add Q&A entry for /chronicle skills review
  in the Common Questions section

Sources:
- https://github.com/github/copilot-cli/commit/c802cc3f06ffd2a57968cf8efabd3d550650ac5e
  (changelog for v1.0.66)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Aaron Powell <me@aaron-powell.com>

website/src/content/docs/learning-hub/creating-effective-skills.md

@@ -3,7 +3,7 @@ title: 'Creating Effective Skills'
 description: 'Master the art of writing reusable, shareable skill folders that deliver consistent results across your team.'
 authors:
   - GitHub Copilot Learning Hub Team
-lastUpdated: 2026-06-25
+lastUpdated: 2026-06-30
 estimatedReadingTime: '9 minutes'
 tags:
   - skills
@@ -403,6 +403,16 @@ A: Yes, since v1.0.44. You can include multiple slash commands in a single messa
 
 A: Yes, for clarity. Show examples of desired output format, patterns to follow, or anti-patterns to avoid. For complex schemas or formats, consider bundling them as reference files rather than inline examples.
 
+**Q: How do I review agent-proposed skill changes?**
+
+A: In v1.0.66+, the agent can propose draft skill additions or improvements as it discovers reusable patterns during a session. Review each draft interactively with:
+
+```
+/chronicle skills review
+```
+
+This opens a review flow where you can accept, reject, or defer each proposed change — giving you full control over how your skill library evolves. No changes are applied until you approve them.
+
 ## Common Pitfalls to Avoid
 
 - ❌ **Vague description**: "Code helper" doesn't help agents discover the skill