chore(kb): add memory/kb to git tracking

memory/* was fully ignored; now only memory/kb/ is tracked
so notes, coaching sessions, insights, and project docs are
versioned while embeddings and sqlite databases stay untracked.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

memory/kb/insights/2026-04-02-second-brain-starter.md

@@ -0,0 +1,38 @@
+# Second Brain Starter - Cole Medin
+
+**Link:** https://github.com/coleam00/second-brain-starter
+**Dată:** 2026-04-02
+**Tags:** @tools @architecture
+
+## Ce e
+
+Skill pentru Claude Code care generează PRD personalizat pentru construire "AI second brain" - asistent proactiv cu memory persistent.
+
+## Arhitectură similară cu Echo
+
+- **Memory:** SOUL.md, USER.md, MEMORY.md + daily logs
+- **Search:** Hybrid (70% vector + 30% keyword) via FastEmbed + SQLite
+- **Heartbeat:** Monitoring proactiv la 30 min
+- **Integrări:** Python CLI wrappers (Gmail, Slack, Calendar, Asana, Linear, GitHub)
+- **Hooks:** SessionStart, PreCompact, SessionEnd pentru persistență
+- **Proactivitate:** 4 niveluri (Observer, Advisor, Assistant, Partner)
+
+## Ce avem deja similar
+
+✅ Memory persistent (memory/YYYY-MM-DD.md + kb/)
+✅ Memory search (Ollama + SQLite)
+✅ Heartbeat 2h (email, calendar, git)
+✅ Integrări (Email, Calendar, Git, ANAF, bonuri, YouTube)
+✅ Cron jobs automation
+✅ Chat Discord/WhatsApp
+
+## Ce ar fi util (nu prioritar)
+
+- **Hooks** pentru persistență automată SessionStart/End
+- **Hybrid search** (vector + keyword combinat)
+- **Reply drafts** în vocea utilizatorului (RAG pe mesaje)
+- **Habit tracking** mai structurat
+
+## Notă
+
+Nu refacem - Echo e funcțional. Link păstrat pentru inspirație incrementală viitoare.