fix(cli): launch child commands cross-platform on Windows

[AmanVarshney01]

Summary

• run Composer child commands through cross-spawn instead of raw node:child_process.spawn
• preserve structured argv, inherited stdio, environment ownership, signals, and exact child exit status
• use the same focused process primitive in both the consolidated CLI host and programmatic Composer control path
• keep shell: false; no command-string parsing or quoting is introduced
• make the Windows path, directory-link, and test-fixture behavior exposed by permanent platform CI portable

Problem

Composer resolves the installed node_modules/.bin/alchemy command and passed it directly to raw spawn. That works for Unix executables, but Windows package-manager shims and shebang launchers cannot be launched reliably that way. The child never reached Alchemy and the CLI reported CLI.SPAWN_FAILED.

This matches the create-prisma@0.11.2 telemetry: all 11 structured CLI.SPAWN_FAILED deployment errors were on Windows.

cross-spawn provides the narrow compatibility layer needed for Windows shim and shebang resolution while retaining argument boundaries and avoiding shell: true. It is already present in the runtime dependency graph through Alchemy, so this adds only a direct ownership declaration and development-only types, not a new runtime package tree. The CLI engine still owns cancellation and process status policy; this PR only replaces the host process primitive behind its existing SpawnChild seam.

Verification

• all required checks pass, including Linux, macOS, Windows, DCO, CodeQL, builds, and type checks
• Windows: 23/23 tasks across the changed supported packages, 22/22 artifact-packaging tests, and 10/10 installed-CLI integration tests through pnpm's real generated .CMD shim
• macOS: the full repository test suite with PostgreSQL 16
• deploy E2E, ORM demo, bucket E2E, cold-connect canary, and cold-start canary all pass
• focused run-alchemy and runtime suites: 31 passed locally
• Composer and Composer CLI builds keep cross-spawn external

The Windows job builds every package, then tests every changed package whose surface is supported on Windows plus the installed CLI deploy surface. It does not run the known-unsupported local-dev/log suites. A full-suite attempt also exposed an unrelated existing Bun-for-Windows hang in the lowering resource-reporter deadline test, so the changed lowering artifact suite is exercised directly instead.

The separately observed Next.js standalone absolute-link assembly failure remains handled by the focused Next.js PR #272; this PR covers the general Windows directory-link behavior found while adding platform CI.

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---

Summary by CodeRabbit

• Bug Fixes
  • Improved command execution across platforms, including Windows executable shims and shebang-based binaries.
  • Preserved argument and environment forwarding when launching commands.
  • Improved runtime behavior when executing package-provided binaries without invoking a shell.
• Tests
  • Added coverage for package binary execution, successful completion, argument and environment forwarding, and cleanup.
  • Updated signal-termination testing to account for Windows platform behavior.

Walkthrough

The CLI and runtime process adapters now use cross-spawn. Affected packages declare the runtime and type dependencies. Runtime tests verify executable shebang handling without a shell and temporary-directory cleanup. The SIGTERM test remains active on supported platforms and skips on Windows.

Merge Risk: ⚪ Minimal · up to ccb69

The PR changes child-command launching to use cross-platform resolution while preserving existing argument, environment, signal, and exit-status behavior. Windows execution and the relevant tests and builds passed, so no actionable merge-blocking risk remains.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 5 files.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly and concisely describes the main change: launching CLI child commands cross-platform on Windows.
Description check	✅ Passed	The description directly explains the cross-spawn change, its Windows compatibility purpose, preserved behavior, affected paths, and verification results.

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In `@packages/0-framework/3-tooling/cli/src/__tests__/run-alchemy.test.ts`:
- Line 122: Update the expected arguments in the alchemyCommandLine test to
match the runtime: retain the direct Bun argument shape when
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Inline comments:
In @.github/workflows/windows-next-diagnostic.yml:
- Line 50: Update the workflow step around result.entry to verify that it refers
to an existing file before logging it, causing the diagnostic to fail when the
standalone artifact is absent; retain the existing logging only after this file
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Inline comments:
In @.github/workflows/windows-next-diagnostic.yml:
- Line 54: Update the standalone-entry existence check after assemble() to
resolve result.entry against result.dir using path.join, and use that resolved
path for both fs.existsSync and the error message.

In `@packages/0-framework/3-tooling/cli/src/run-alchemy.ts`:
- Around line 133-138: Set windowsHide to false in the Execa options used by
both spawnAlchemy in run-alchemy.ts and spawnChild in family/runtime.ts,
preserving Windows Ctrl-C/SIGINT delivery while leaving the other process
options unchanged.
- Line 137: Update the spawnAlchemy invocation options to set extendEnv: false,
and ensure AlchemyInvocation.env explicitly includes required runtime variables
such as PATH instead of relying on process.env inheritance; preserve the
existing reject behavior.

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Inline comments:
In `@packages/0-framework/3-tooling/cli/src/family/__tests__/runtime.test.ts`:
- Line 257: Update the createRuntime regression test to pass the single argument
value “ok value” and assert that process.argv[2] preserves it exactly, exposing
accidental shell execution. Ensure this regression test runs on both POSIX and
Windows while retaining the existing non-shell cross-spawn behavior.

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