langroid

Python 3.13 support and Task.init() memory leak fix

Python 3.13 support

PR [#1011](https://github.com/langroid/langroid/pull/1011) bumps the supported Python range to >=3.10,<3.14 and adds Python 3.13 to the CI matrix alongside 3.11, so Langroid is now tested on both versions on every push.

• pyproject.toml: requires-python = "<3.14,>=3.10"
• .github/workflows/validate.yml: lint/test job now runs against ["3.11", "3.13"]

Fix ObjectRegistry memory leak in Task.init()

PR [#1022](https://github.com/langroid/langroid/pull/1022) (originally [#1021](https://github.com/langroid/langroid/pull/1021)) fixes a memory leak in Task.init(). The method built a temporary ChatDocument solely to feed log_message(Entity.SYSTEM, ...), but ChatDocument.__init__ auto-registers every instance in the class-level ObjectRegistry, so each new Task left behind a system-message doc that was never freed. In long-running services that spawn many tasks (e.g. servers), this accumulated significantly over time.

The fix:

• explicitly removes the temporary doc via ChatDocument.delete_id(...) after logging
• renames the local to system_message_temp_doc to make its transient nature obvious
• adds a regression test (test_task_init_no_registry_leak) mirroring the PR #939 leak-check pattern, asserting that repeated Task(...).init() calls leave zero leaked ChatDocuments in the registry

Thanks to @alexagr for the catch and the original fix.