build: exclude pylibseekdb 1.3.0.post1 (hangs embedded checkpointer) (#159)

pylibseekdb 1.3.0.post1 (with pyseekdb 1.3.0) adds a close() interface, but
pyobvector's embedded engine wires _SeekdbConnection.close() -> _client._cleanup()
and runs under poolclass=NullPool, which closes the DBAPI connection after every
checkout. Because the embedded backend is a process-wide singleton, this tears
down the shared SeekDB connection after each query; the checkpointer then hangs
indefinitely on the repeated open/cleanup cycle (reproduced: conformance suite
~3s on 1.3.0, >4min hang on 1.3.0.post1).

Constrain to >=1.3.0,!=1.3.0.post1,<2 so a fresh resolve can't silently pull the
broken post-release. Re-allow once pyobvector exposes a one-shot disposal seam
that doesn't fire per-connection (upstream issue filed).

Lock regenerated with Poetry 2.1.3 (matches CI); resolved versions unchanged.

Author: webup

poetry.lock

@@ -27,8 +27,12 @@ langgraph-checkpoint = ">=3.0.1,<5.0.0"
 # >=1.2: unified SeekDB client. Constrain pylibseekdb so the lock resolves to 1.1+ (manylinux + macOS arm64 wheels);
 # 1.0.0.post1 is Linux-wheel-only metadata and breaks Poetry on macOS arm64 / some CI installers.
 pyseekdb = { version = ">=1.2.0.post1,<3", optional = true }
-# >=1.3: fixes segfault in embedded mode when data dirs are reused (oceanbase/seekdb#870)
-pylibseekdb = { version = ">=1.3.0,<2", optional = true, markers = "sys_platform == 'linux' or (sys_platform == 'darwin' and platform_machine == 'arm64')" }
+# >=1.3: fixes segfault in embedded mode when data dirs are reused (oceanbase/seekdb#870).
+# !=1.3.0.post1: that post-release wires a per-connection close()->_cleanup() into
+# pyobvector's NullPool embedded engine, tearing down the shared process-wide SeekDB
+# singleton after every query and hanging the checkpointer (see oceanbase/pyobvector
+# tracking issue). Re-allow once pyobvector exposes a one-shot disposal seam.
+pylibseekdb = { version = ">=1.3.0,!=1.3.0.post1,<2", optional = true, markers = "sys_platform == 'linux' or (sys_platform == 'darwin' and platform_machine == 'arm64')" }
 pyobvector = [
     { version = ">=0.2.25" },
     { version = ">=0.2.25", extras = ["pyseekdb"], markers = "extra == 'pyseekdb'" },