docs: add autonomous run protocol

[dapi]

Goal

Add a generic, governed Autonomous Run Protocol that connects a tracker task to a delivery artifact, isolated agent workspace, evidence packet, and human handoff without making the template dependent on a specific tracker, agent, CI, or cloud provider.

Acceptance criteria

• A single canonical document defines the end-to-end contract: tracker task → delivery artifact (FT-* or another flow owner) → isolated workspace → agent run → evidence → handoff/closure.
• The protocol is integration-neutral: no Linear/GitHub/Codex/CI/cloud-specific assumptions; integrations are adapters and project configuration.
• Dispatch gates require a selected flow, a link to its canonical owner, and all applicable upstream readiness gates (including Problem Ready and, where required, Solution Ready).
• The protocol identifies work that must not be dispatched autonomously: Human Routing, incomplete intent/acceptance, required external approval, or uncontrolled security/production risk.
• It specifies a deterministic isolated-workspace contract, lifecycle, reuse/cleanup rules, and prevention of concurrent runs for one delivery unit.
• It specifies a minimal run-state contract with idempotent claim, bounded concurrency, retry/backoff, eligibility reconciliation, cancellation, and restart recovery.
• It defines an evidence packet: change/PR reference, required-check results, acceptance evidence, manual-only gaps, residual risks, and handoff state. A successful process exit alone is not completion.
• It specifies the least-privilege secret and external-action posture and delegates project decisions to autonomy boundaries.
• Existing indexes and canonical documents link to the protocol without duplicating owned facts.
• memory-bank-cli lint, memory-bank-cli doctor --profile template, and git diff --check pass; no downstream-specific terms leak into memory-bank-template/.

References

• OpenAI Symphony SPEC.md
• Existing Feature Flow, Validation Profiles, Autonomy Boundaries, and Session Handoff