Runtime health picture composed from all Phase 1 data.

Assembles project status from:

• Compilation state (compiled_at from .beam files)
• Stack versions (from mix.lock)
• Lint violations (from Foundry.Lint.Runner)
• Migrations (pending count from Foundry.Manifest)
• Proposals (open count from proposal storage)
• Compliance matrix (from Foundry.Context.ProjectContext)
• Test coverage (from project fixture)
• CI state (from lock file and optional .foundry/ci_status.json)
• Project manifest metadata