fix(cli): improve cross-platform dev experience and onboarding

[islahuddinn]

Summary

Three small, related contributor-facing fixes:

#241 — Windows-safe CLI test gh stubs

• Adds shared packages/cli/test/gh-stub.mjs
• Installs cross-platform gh shims (gh.cmd on Windows, executable wrapper elsewhere)
• Joins PATH with path.delimiter instead of hard-coded :
• Sets invalid GH_HOST / GH_TOKEN so tests fail closed if the stub does not engage
• Skips POSIX 0600 mode assertions on Windows (NTFS has no meaningful Unix modes)

#240 — Node engine floor for pnpm 11

• Raises root engines.node to >=22.13.0
• Adds preinstall probe that requires the node:sqlite builtin pnpm 11 depends on
• Documents the requirement in CONTRIBUTING.md

#229 — unreachable --canary-bot init flag

• Allowlists --canary-bot in the init CLI validator and help text
• Adds an init test asserting the custom canary bot login renders into the crew workflow

Fixes #241
Fixes #240
Fixes #229

Test plan

• pnpm --filter @theagilemonkeys/facility test (102 passed, 1 skipped)
• Delivery and doctor resolver tests still use deterministic gh fixtures
• Init test covers --canary-bot=acme-canary[bot]

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