ci: temporary Windows exact-head proof for #265 and #266

[safal207]

Purpose

Temporary repository-owned Windows execution proof for two unchanged draft PR heads:

• Make MCP Mix invocation portable on Windows #265 at 70d4a98a4801884b1c75df0166154e2d6d28853b
• Fix Windows worker executable resolution #266 at e62820c8f3a22ec6f26b027805e2a0ff1a73f509

Bounded verification

• Windows runner only.
• Each job checks out its literal target SHA rather than this workflow PR's merge ref.
• Initial and final git rev-parse HEAD must both match the expected SHA.
• Make MCP Mix invocation portable on Windows #265 runs the repository MCP smoke harness, exercising the Windows mix.cmd, path.delimiter, and Windows shell-launch branch.
• Fix Windows worker executable resolution #266 builds solver_port.exe and runs only test/port_worker_test.exs, exercising the Windows executable-selection branch.
• Both jobs upload a seven-day evidence artifact containing identity, runner, command, exit status, and raw target logs.

Excluded

No implementation changes, dependency changes, broad test matrix, merge approval, Ota adoption decision, or modification to #265/#266.

This PR is temporary and should not be merged. Close it after the artifacts have been independently checked. Until both exact-head jobs execute successfully, #265 and #266 remain HOLD / NOT_RUN.

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[safal207]

Exact-head Windows verification completed: run 33766318986.

Target	Windows proof	Identity	Result
#265 70d4a98a4801884b1c75df0166154e2d6d28853b	node integrations/mcp/smoke.mjs	before = after = expected	14 assertions passed; exit 0
#266 e62820c8f3a22ec6f26b027805e2a0ff1a73f509	build solver_port.exe; mix test test/port_worker_test.exs	before = after = expected	3 tests, 0 failures; exit 0

Artifacts were independently downloaded and integrity-checked against the GitHub digests:

• pr-265-windows-exact-head: sha256:1be6e23525275d0c51d765a480fda70d5a415d6b51b57921f8cc963fb1c7457b
• pr-266-windows-exact-head: sha256:2e4b25cc1e109b68bdc9e77fa80c03a4a790a6b0f095d0628ac1116844652bb3

Final GitHub recheck after artifact collection confirmed both PR heads are still unchanged.

Bounded verdict: the previously NOT_RUN Windows-specific gate is now PASS for these exact revisions. This is execution evidence only; it does not merge either PR, broaden tested scope, or grant general merge/product approval. Keep this temporary workflow PR unmerged.