[ronaldtse]

Fixes the fleet-wide red Windows legs: Unable to locate executable file: metanorma.exe (metanorma/packed-metanorma#274).

Since the 1.17.0 Chocolatey package switched Windows installs to the packed-metanorma MSI (packed-metanorma#259), the generate workflows of every mn-samples repository fail on windows-latest:

• the MSI adds its install directory to the machine PATH,
• each Actions step is a fresh process that inherits the environment captured at job start, so that PATH change is invisible to every later step,
• ChocoInstaller exported nothing, so the setup step reported success while the binary stayed unreachable.

The fix: after a successful choco install metanorma, query the Windows uninstall registry for the Metanorma entry's InstallLocation and export it via core.addPath, covering both flat and bin-subdirectory MSI layouts (with a warning fallback if no entry is found).

Validated: npm run build (tsc + esbuild) and the full vitest suite (12 files, 138 tests) pass. The repo's integration-test / idempotency-test Windows workflows exercise the choco path end-to-end on real runners.

Cut as 3.1.1 (patch); v3 needs re-pointing after release so the fleet picks it up.

[ronaldtse]

Attribution of the remaining red legs (none are caused by this change — the choco path this PR touches is verified working in the CI logs):

• Test Idempotency Windows / Native Package Windows: the bootstrap-seed.cmd shipped in the packed-metanorma v1.17.0-1 MSI fails on every machine — tebako install metanorma dies with runtime "java@21.0.12;tebako=2.8.50-temurin;image" is pre-era — no readable release index for it (tebako-runtime-openjdk v2.8.50 was built by the pre-contract factory). The shims directory is created empty, so metanorma cannot resolve anywhere. Full evidence and fix options in Chocolatey package 1.17.0 (MSI): metanorma.exe not on PATH for later GHA steps — Windows generate legs red fleet-wide metanorma/packed-metanorma#274. This PR makes that failure loud (logs the seed output, warns when the shim is missing) instead of silent.
• Compile/Site windows-latest gem: metanorma-ogc 2.10.0 (released stable) ships a lib/relaton/render shadow that breaks under relaton-render 3.x (uninitialized constant Relaton::Render::Parse). The stable wave cutting 2.10.1 (shadow-free) clears these; they pass with the candidate line.
• Compile/Site macos/ubuntu and Docker Gem legs: these integration workflows have not run on a PR since February 2026 (no main-branch runs either); the same legs fail on a Windows-only-no-op diff, indicating long-standing environmental rot in those workflows.

What this PR delivers today: correct PATH export of the MSI's bin and home/shims directories, re-running of the idempotent seed, registry-based install-dir discovery, and loud diagnostics for the shim failure — so the Windows legs go green the moment packed-metanorma republishes a fixed MSI.