Self-describing boot identify schema and FO contract ratchet for multi-workflow discovery

[clkao]

Self-describing boot identify JSON schema and First Officer contract ratchet to eliminate LLM duplicate CLI retry loop on multi-workflow discovery.

What changed

• Append schema, status: "complete", result: "multiple_workflows", terminal: true, workflow_count, and next_action: "select_workflow" to many-workflow --boot --identify --json output.
• Ratchet «state.boot» effect/done-when and «interaction.boundary» greet line in first-officer-shared-core.md so multi-workflow boot discovery is terminal and greets with workflow selection.
• Update command-reference.md to describe the multi-workflow multiple_workflows discovery record.
• Add Go tests in boot_identify_test.go and fo_function_reference_invariant_test.go.

Evidence

• go test ./... and go test ./... -race passed cleanly.
• go test ./internal/status and go test ./internal/contractlint passed.

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[clkao]

Superseded by #584, which rebases the validated argv-ledger and self-describing boot candidate onto current main without force-pushing this historical branch.