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

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

src/decisions/DECISIONS_2026-02-17T15-00-00Z.md

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+# Decisions - 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
+
+## Decision: Implement `features/log-summary.mjs`
+
+### Context
+Developers and agents need a quick way to see the recent history of automated tasks without navigating the file system. Prompt: `src/prompts/weekly/feature-proposer-agent.md`.
+
+### Options Considered
+1. **Dashboard Widget**: Requires frontend changes, more complex.
+2. **Lock Monitor**: Already covered by `lock:check`.
+3. **Log Summary CLI**: Simple, standalone, immediate value.
+
+### Decision
+Chosen Option 3 (Log Summary CLI).
+
+### Rationale
+- Fits the "single file" constraint perfectly.
+- No external dependencies required.
+- High utility for checking system health at a glance.