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Make Windows Tentacle install path-agnostic and auto-elevate

Placeholder ppxd requested to merge feat/windows-install-resilience into main

Summary

Closes three operator-visible failures in the Squid-generated Windows install snippet, plus a CI repro fix:

  • Wrong binary name: server emitted squid-tentacle.exe, but the .NET publish output is Squid.Tentacle.exe (per Squid.Tentacle.csproj RootNamespace). Every install hit "file not found" at register.
  • Hardcoded install path: server emitted 'C:\Program Files\Squid Tentacle\…', breaking operators who override \$env:INSTALL_DIR or -InstallDir.
  • No UAC auto-elevation: install-tentacle.ps1 errored out for non-admin shells instead of triggering UAC.
  • Em-dash parse error: PowerShell 5.1 mis-decoded em-dashes under OEM codepage on windows-latest runners. Fixed + drift detector pinned.

Three-layer fix:

  1. install-tentacle.ps1 writes %ProgramData%\Squid\Tentacle\install-info.json (Schema=1) after extraction.
  2. install-tentacle.ps1 auto-elevates via Start-Process -Verb RunAs. Handles both file invocation and irm | iex pipe invocation. Skippable via -NoAutoElevate for CI / SYSTEM-context.
  3. WindowsPowerShellScriptBuilder reads the discovery file in Step 2; uses \$tentacle throughout Steps 3-4. Wraps register-call \$LASTEXITCODE = 403 with a structured error naming MachineCreate permission + the granting built-in roles (Environment Manager / Space Owner).

Tests:

  • Unit (8 new): drift detectors for binary name, discovery-file path, em-dash absence in generated content, 4-step ordering, missing-discovery-file error, 403 hint contents, role-list accuracy.
  • E2E (9 new in resilience matrix): install-info.json schema, BinaryPath reflects -InstallDir, idempotence stress (5×), corrupt-state recovery, paths-with-spaces.

Test plan

  • Unit: 5217/5217 pass locally
  • Build: zero errors across all projects
  • Windows CI: install-tentacle.ps1 + WindowsPowerShellScriptBuilder + 9 new resilience E2E tests pass on `windows-latest`

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