docs: add changelog improvement ideas to TODO file

TODO.md

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+# TODO
+
+## Git-Cliff / Changelog Improvements
+
+### Idea: Use Merge Commit Body as Documentation
+
+* **Context**: Normally, only the commit subject is included in changelogs.
+* **Idea**: Treat merge commits as *project documentation*.
+
+  * The subject line = headline of the feature / branch.
+  * The body = narrative explanation of what the branch accomplished.
+  * Child commits = detailed steps, already included under the merge.
+
+### Benefits
+
+* Provides more context for each feature branch.
+* Turns the changelog into a lightweight project documentation.
+* Keeps individual commits small and clean while still showing the bigger picture.
+* Optional: if no body is present, nothing changes.
+
+### Possible Implementation
+
+* In the changelog template:
+
+  * Detect merge commits.
+  * Render `commit.body` below the subject line.
+  * Indent and format properly (e.g. bullet points preserved).
+
+### Example
+
+```
+### 🚀 Features
+
+- 🔀 **Merge branch 'feature/oauth2'** - ([abc1234](...))
+    Add OAuth2 login flow with full explanation of scope:
+    - why OAuth2 was chosen
+    - compatibility with existing login
+    - possible future extensions
+
+    - *(auth)* Add login endpoint - ([def5678](...))
+    - *(auth)* Implement token exchange - ([ghi9012](...))
+    - *(auth)* Add error handling - ([jkl3456](...))
+    - *(test)* Add unit tests for OAuth2 flow - ([mno7890](...))
+```
+
+---