mcp-nexus

## ADDED Requirements ### Requirement: Release preflight validation SHALL verify repository layout integrity The system SHALL provide a preflight validation command that verifies required files and directories exist in the assembled release artifact. #### Scenario: Assembled release is incomplete - **WHEN** required files or folders are missing from the release artifact - **THEN** preflight validation fails with explicit missing-item output and non-zero exit. ### Requirement: Preflight validation SHALL enforce OpenSpec spec integrity The release workflow SHALL run strict OpenSpec validation for specs before upload. #### Scenario: Spec validation fails - **WHEN** `openspec validate --specs --strict` reports errors - **THEN** upload is blocked until validation passes. ### Requirement: Preflight validation SHALL include implementation sanity checks The release workflow SHALL define mandatory implementation sanity checks for key packages before upload. #### Scenario: Operator executes preflight checklist - **WHEN** preflight checks run - **THEN** required typecheck/test/build commands are executed or explicitly acknowledged as skipped with rationale. ### Requirement: Preflight output SHALL be actionable for operators Validation output SHALL include next steps and command suggestions to fix failing checks. #### Scenario: Preflight check fails - **WHEN** any validation step fails - **THEN** output includes the failed check name and corrective command hints.