feat: session naming with unique titles, auto-lineage, rich listing, resume by name

- Schema v4: unique title index, migration from v2/v3
- set/get/resolve session titles with uniqueness enforcement
- Auto-lineage: context compression auto-numbers titles (Task -> Task #2 -> Task #3)
- resolve_session_by_title: auto-latest finds most recent continuation
- list_sessions_rich: preview (first 60 chars) + last_active timestamp
- CLI: -c accepts optional name arg (hermes -c 'my project')
- CLI: /title command with deferred mode (set before session exists)
- CLI: sessions list shows Title, Preview, Last Active, ID
- 27 new tests (1844 total passing)

hermes_cli/commands.py

@@ -34,6 +34,7 @@ COMMANDS = {
     "/platforms": "Show gateway/messaging platform status",
     "/verbose": "Cycle tool progress display: off → new → all → verbose",
     "/compress": "Manually compress conversation context (flush memories + summarize)",
+    "/title": "Set a title for the current session (usage: /title My Session Name)",
     "/usage": "Show token usage for the current session",
     "/insights": "Show usage insights and analytics (last 30 days)",
     "/paste": "Check clipboard for an image and attach it",