Restore the changelog workflow wording

The guide refresh unintentionally changed the contributor workflow to
creating the pull request before its changelog entry; keep the original
policy text.

Signed-Off-By: Cristiano Calcagno <ccrisccris@gmail.com>
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PCtQiaDijUqA2fujQXvKUw

Author: cristianoc

AGENTS.md

@@ -149,7 +149,7 @@ Read the area guide before changing a compiler subsystem:
    - Unit tests for utility functions
    - Always check JavaScript output quality
 
-4. **Add a `CHANGELOG.md` entry** for any user-facing change (bug fix, feature, or breaking change). Create the PR first, then put the entry under the matching section of the current `(Unreleased)` version and end it with the PR link. See [CONTRIBUTING.md](CONTRIBUTING.md).
+4. **Add a `CHANGELOG.md` entry** for any user-facing change (bug fix, feature, or breaking change). Put it under the matching section of the current `(Unreleased)` version and end the line with the PR link. See [CONTRIBUTING.md](CONTRIBUTING.md). PRs are expected to include one.
 
 ### Debugging Techniques
 

CONTRIBUTING.md

@@ -440,7 +440,7 @@ Adding a new entry there requires re-running the analysis tests. Follow these st
 
 (If a `make` command fails, consider using the [DevContainer](#b-devcontainer).)
 
-Finally, add a line to [CHANGELOG.md](CHANGELOG.md), using the `#### :nail_care: Polish` section. Create the pull request first, then add the entry with its PR link.
+Finally, add a line to [CHANGELOG.md](CHANGELOG.md), using the `#### :nail_care: Polish` section.
 
 ## Code structure