test: make ecosystem CLI checks portable on Windows

[huanglianggit]

Problem

tests/ecosystem-cli.test.ts fails on Windows even though its assertions are platform-independent. A CRLF checkout prevents the workflow-condition helper from finding the if block, and the fake npm command is written only as a POSIX executable, while Windows command resolution expects npm.cmd.

Baseline on Windows: 5 failed, 12 passed.

Root cause

The test helper parses workflow text with LF-only delimiters, and the subprocess fixture installs only an extensionless shell script on PATH.

Fix

• Normalize workflow line endings before extracting jobs.
• Add an explicit CRLF regression.
• Write the successful npm fixture as npm.cmd on Windows while preserving the existing POSIX stub elsewhere.

Tests

• pnpm exec vitest run --config vitest.config.mts --update=none tests/ecosystem-cli.test.ts --reporter=verbose (18 passed)
• pnpm exec vitest run --config vitest.config.mts --update=none --exclude tests/ecosystem-cloudflare-credential-lifecycle-security.test.ts --reporter=dot (125 files, 3,966 tests passed)
• pnpm exec oxfmt --check tests/ecosystem-cli.test.ts
• pnpm exec oxlint tests/ecosystem-cli.test.ts
• pnpm exec tsc --pretty false
• pnpm build

Compatibility / Risk

Test-only change. SDK runtime behavior and exports are unchanged. POSIX fixtures keep their existing shell-script behavior; Windows uses the native .cmd lookup path. The broader Windows run excludes the pre-existing credential lifecycle suite because it exercises POSIX file-mode, link, and signal semantics outside this patch.