[OTimileyin]

Align exit code definitions in the documentation site (index.html) with Phase 2 implementation and documentation specifications:

• 0: No discrepancies or unknowns; full parity achieved.
• 1: Execution error (configuration, validation, network, or file system failure).
• 2: Discrepancies without unknowns.
• 3: One or more unknowns, including mixed results.

[vercel]

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