docs: introduce standard AI log entry format

- add standardized AI BUILD ENTRY and AI PLAN ENTRY format
- improve consistency of AI development logs
- update instructions-agent.md

docs/ai-worklog.md

@@ -31,3 +31,27 @@ Entries must be concise and chronological.
 - validation: not run
 - result: The repository now defines mandatory AI logging in `instructions-agent.md` and includes dedicated log files for AI work history and prompt summaries.
 - open issues: None.
+
+### AI BUILD ENTRY
+Date: 2026-03-15  
+Task: build  
+Objective: Record the introduction of the standard AI log entry format and improve AI logging consistency.
+
+Files Modified:
+- `instructions-agent.md`
+- `docs/ai-worklog.md`
+- `docs/ai-prompts.md`
+
+Key Decisions:
+- Add a dedicated "Standard AI Log Entry Format" section to define `AI BUILD ENTRY` and `AI PLAN ENTRY` blocks.
+- Use the new standardized format for this worklog update to establish the pattern in the repository logs.
+
+Validation:
+- make fix (passed)
+- make quality (passed)
+
+Result:
+- The repository now documents a standard AI log entry format and uses it to improve consistency of AI-assisted development logs.
+
+Open Issues:
+- None.