* feat(extensions): port update-agent-context to Python
Ports the agent-context extension updater to a single Python script,
per #3281 and the check-prerequisites PoC pattern from #3302. The bash
version already ran its core logic through embedded Python heredocs, so
the port lifts that logic into a standalone script. Parity tests run
bash and Python side by side and compare output and resulting
context-file bytes.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
* fix(extensions): match bash case-insensitivity on MSYS, test unparseable config gate
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
