Add FlowSight spec docs + ignore Ruflo runtime artifacts

- TODO.md / ROADMAP.md work tracking (Now/Next/Maintenance, Shipped/Next/Later/Declined)
- docs/: PLAN, API-REFERENCE (70 Sectors v2 paths), TECH-STACK (Go+SolidJS+StyleX),
  ARCHITECTURE, ROUTINES, AGENT-SPECS, DATA-MODEL, API
- .gitignore: Ruflo runtime (.swarm, .claude, .claude-flow, .agents, *.db, .mcp.json)

.gitignore

@@ -0,0 +1,19 @@
+# Ruflo local secrets and runtime data
+.env
+.env.local
+.env.*.local
+.claude-flow/data/
+.claude-flow/logs/
+.claude-flow/sessions/
+
+# Ruflo runtime artifacts (not source)
+.swarm/
+.claude/
+.claude-flow/
+.agents/
+ruvector.db
+*.db
+*.db-shm
+*.db-wal
+.mcp.json
+CLAUDE.md