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)

tests/hermes_cli/test_commands.py

@@ -11,7 +11,7 @@ EXPECTED_COMMANDS = {
     "/help", "/tools", "/toolsets", "/model", "/provider", "/prompt",
     "/personality", "/clear", "/history", "/new", "/reset", "/retry",
     "/undo", "/save", "/config", "/cron", "/skills", "/platforms",
-    "/verbose", "/compress", "/usage", "/insights", "/paste",
+    "/verbose", "/compress", "/title", "/usage", "/insights", "/paste",
     "/reload-mcp", "/quit",
 }