fix(system): handle command-check and version parse failures

[MuncleUscles]

Fixes #301.
Fixes #303.
Supersedes #337 because the contributor fork branch could not be updated from this environment.

Changes:

• Treat any failed command check as a missing requirement instead of only checking stderr/ENOENT.
• Throw explicit parse errors when tool version output does not contain an X.Y.Z version.
• Add regression coverage for ENOENT, empty/non-matching version output, and command failures without stderr.

Verification:

• npm run test -- tests/libs/system.test.ts
• npm run test:coverage
• npm run build

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