chore(release): bump to 3.3.401

Sync with upstream/develop via cherry-pick of 9 critical bugfixes:
- HNSW index bloat prevention (MemPalace#1191)
- SIGSEGV guards on collection reopen (MemPalace#1262, MemPalace#1289)
- blob-seq marker fast-path (MemPalace#1177)
- palace_graph None-metadata guard (MemPalace#1201)
- palace_graph security tunnels (MemPalace#1168)
- hyphenated wing name normalization (MemPalace#1197)
- searcher _tokenize None guard (MemPalace#1198)
- mcp_server diary topic sanitize (MemPalace#936)

Tests: 1459 default + 113 benchmark + 6/7 stress all pass.
(random-kill stress test was failing on dev pre-merge; not regressed.)

Author: Scorpion

README.md

@@ -258,7 +258,7 @@ PRs welcome. See [CONTRIBUTING.md](CONTRIBUTING.md).
 MIT — see [LICENSE](LICENSE).
 
 <!-- Link Definitions -->
-[version-shield]: https://img.shields.io/badge/version-3.3.311-4dc9f6?style=flat-square&labelColor=0a0e14
+[version-shield]: https://img.shields.io/badge/version-3.3.401-4dc9f6?style=flat-square&labelColor=0a0e14
 [release-link]: https://github.com/MemPalace/mempalace/releases
 [python-shield]: https://img.shields.io/badge/python-3.9+-7dd8f8?style=flat-square&labelColor=0a0e14&logo=python&logoColor=7dd8f8
 [python-link]: https://www.python.org/

mempalace/version.py

@@ -1,3 +1,3 @@
 """Single source of truth for the MemPalace package version."""
 
-__version__ = "3.3.311"
+__version__ = "3.3.401"

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "mempalace"
-version = "3.3.311"
+version = "3.3.401"
 description = "Give your AI a memory — mine projects and conversations into a searchable palace. No API key required."
 readme = "README.md"
 requires-python = ">=3.9"