feat: implement log-summary utility as feature-proposer-agent

Co-authored-by: PR0M3TH3AN <[email protected]>

src/todo/TODO_2026-02-17T15-00-00Z.md

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+# Todo - Feature Proposer Agent Run
+
+**Agent**: feature-proposer-agent
+**Cadence**: weekly
+**Run-Start**: 2026-02-17T15:00:00Z
+**Prompt-Path**: src/prompts/weekly/feature-proposer-agent.md
+
+## Completed
+- [x] Analyze repository for potential features.
+- [x] Select `log-summary.mjs` as the target feature.
+- [x] Create `features/` directory.
+- [x] Implement `features/log-summary.mjs`.
+- [x] Verify the script functionality.
+- [x] Follow instructions in `src/prompts/weekly/feature-proposer-agent.md`.
+
+## Pending
+- [ ] Incorporate into main CLI (future work).