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.claude/commands/changelog.md

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+Generate or update the project changelog.
+
+Arguments (optional): $ARGUMENTS
+
+Instructions:
+1. Parse arguments: first argument is optional date (YYYY-MM-DD), remaining text is semicolon-separated description of changes.
+   - If no date provided, use today's date.
+   - If no description provided, summarize changes from the current conversation or use "Aktualizacja projektu".
+2. Detect changed files using `git status --porcelain`.
+3. Read the existing changelog file `changelog/<date>.md` if it exists.
+4. Merge new entries with existing ones (deduplicate both "Co zrobiono" points and file list).
+5. Write/update the file with this structure:
+
+```
+# YYYY-MM-DD
+
+## Co zrobiono
+
+- point 1
+- point 2
+
+## Zmienione pliki
+
+- `path/to/file`
+```
+
+6. Show the user what was written.
+
+Rules:
+- Never overwrite existing entries — only append and deduplicate.
+- File list should include both git-detected changes AND files touched in the current conversation.
+- Use Polish section headers as shown above.
+- Keep descriptions concise but informative.