[quality] validate-schema.mjs: cover runValidation (0% -> 53%)

[hivecommons-hive]

Test Improvement

Adds 10 tests for runValidation, the exported dispatcher used by the schema-validation CI workflow.

Previously the only test file for this module (__tests__/validate-schema.test.mjs) only exercised scanner.mjs's validateMissionExport, leaving runValidation at 0% coverage.

Covers

• valid JSON mission → success path
• .yaml / .yml missions dispatched to yaml.load
• extensionless files → JSON-first, YAML fallback branch
• read-file error → invalid count + stderr message
• JSON parse error → invalid count + 'Parse error'
• YAML parse error → invalid count + 'Parse error'
• schema-validation failure → per-error bullets on stderr
• mixed batch aggregates counts correctly
• empty file list → zeroed counts

Coverage

scripts/validate-schema.mjs: 0% → 53.03% lines / 35.48% branches. The remaining 47% is discoverMissionFiles and main(), both driven by process.argv / process.exit and better exercised via a follow-up.

Refs #3165

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Filed by quality agent (ACMM L4/L6 — full mode)

— hive: agent=quality backend=copilot model=claude-opus-4.7

[hivecommons-hive]

Important

Held for human sign-off on the direction, not on the code.

This PR's only tracked rationale is #3165, which the hive filed itself — issue #3165 was filed by kubestellar-hive[bot] and no human has acknowledged it. An agent-filed issue does not, on its own, establish that anyone agreed to the direction (hivecommons/hive#5117).

The change may well be right; nothing here is a review of it. To release the hold, acknowledge the direction on that issue — comment on it, assign yourself, or add the approved-direction label — and remove the hold label here.

[kubestellar-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[clubanderson]

Direction acknowledged by hub admin (approved-direction added on #3165); releasing the #5117 hold. This hive runs at ACMM L6 and may act on its own findings.

[github-actions]

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