Add Xcode Cloud build start control

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Summary

• add a non-idempotent start_build MCP tool backed by Apple’s documented POST /v1/ciBuildRuns endpoint
• support workflow, clean override, source Git reference, pull request, and prior build-run relationships
• keep individual build cancellation explicitly unsupported because Apple exposes no public cancel endpoint
• bump package and server metadata to 0.7.0

Validation

• npm test (39 tests passed)
• npm run build
• npm pack --dry-run
• git diff --check
• version consistency check for package.json/package-lock.json
• no live Xcode Cloud build was started

Risk and behavior

• one successful invocation creates one build run
• the server performs no automatic retry after an ambiguous POST failure
• callers should inspect list_build_runs before deciding whether to retry
• no cancel tool, private API, browser automation, or workflow-mutation surrogate is included

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Final review verdict observed in the authorized ChatGPT conversation:

Verdict: APPROVED
Reviewed-PR: #8
Reviewed-Base: 3c8d416
Reviewed-Head: d331b3a
Blocking-Findings:

• None

Validation: npm test (39 passed), npm run build, npm pack --dry-run, and git diff --check; CI run 36263694002 passed. Reasoning Relay submitted the exact review request, but its durable response collection remained pending due to the acknowledged Relay bug; the repository owner explicitly authorized proceeding with the exact visible approval.