fix: version bump success line names bullet or topic paragraph instead of asking for prose every time (#184)

Files changed:
- CHANGES.md
- VERSION
- tools/chemenu/commands/version_cmd.py

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SnAJ7Z3CpVD3PRbN73QtU2

tools/chemenu/commands/version_cmd.py

@@ -755,8 +755,9 @@ def bump_command(
     impact_note = "" if impact is not None else f" (impact not given - assumed {chosen_impact})"
     success(
         f"{current} -> {new_version}{boundary}. Wrote {version_mod.VERSION_FILENAME} and "
-        f"the {version_mod.CHANGES_FILENAME} entry{impact_note} - write its prose before "
-        f"publishing."
+        f"the {version_mod.CHANGES_FILENAME} entry{impact_note}. A smaller change needs nothing "
+        f"beyond its title; a larger one gets a one-paragraph `###` section for its topic, or "
+        f"rewrites the one its topic already has."
     )