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

[clkao]

Make multi-workflow boot self-describing so First Officers select once without retries, while execution-grounded evidence prevents transcript false positives.

What changed

• Emit a typed terminal envelope for multi-workflow boot.
• Direct First Officers to select from complete discovery results.
• Record boot and filing commands through an argv ledger.
• Grade rejection rounds from canonical durable state.
• Remove superseded transcript matchers and duplicate size guards.

Evidence

• Repository validation: 4/4 passed.
• Pi live journeys: 2/2 passed.

Review guidance

Focus on the argv ledger and durable-round boundary.

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