docs: add biomimicry positioning

docs/biomimicry-positioning.md

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+# Biomimicry Positioning
+
+## Thesis
+
+fable-agent uses biological metaphors only when they map to verifiable engineering primitives:
+
+```text
+immune system → layered security gates
+nervous system → receipt/event observability
+biological computation → adaptive, event-driven evaluation
+```
+
+The product claim stays narrow: fable-agent is not a new organism or orchestrator; it is an agentic attestation layer that records proof, risk, and deploy readiness.
+
+## External validation signals
+
+| Signal | Pattern | fable-agent mapping | Source |
+|---|---|---|---|
+| BioDefense | Immune-system-inspired defense-in-depth for LLM agents | 5-layer verification: safety gate → AST/glyph scanners → build/test/docs → attestation → guarded deploy | [BioDefense gist](https://gist.github.com/andreschauer/e0f958c2a279062559ae8306f946b43d) |
+| Agent Nervous System / agent observability | Tool traces, spans, eval gates, release enforcement | Receipt consumers and `.runs/<id>/channel.jsonl` events | [Braintrust agent observability guide](https://www.braintrust.dev/articles/agent-observability-complete-guide-2026) |
+| SNNs for finance | Biologically inspired temporal/event processing in markets | Event receipts and benchmark set graders over vibes | [arXiv:2512.05868](https://arxiv.org/abs/2512.05868) |
+
+## Architecture analogy
+
+| Biological layer | Engineering layer | Current fable-agent primitive |
+|---|---|---|
+| Innate immune response | Fast input triage | `plinius safety`, content safety gate, adaptive reframing detection |
+| Pattern recognition receptors | Structural threat detection | AST capability scanner, glyph/covert-channel scanner |
+| Adaptive immunity | Learned risk memory | receipts, hallucination detections, RSI verification receipts |
+| Nervous system | Runtime telemetry | channel events, typed receipts, attestations |
+| Motor reflex | Controlled action | guarded `8099/deploy via git-proxy` decision path |
+
+## Boundaries
+
+- Do not claim biological novelty; claim engineering convergence.
+- Do not claim generic self-healing until non-canary degraded repair is proven.
+- Do not treat memory as proof; receipts remain the trust primitive.
+- Current guarded deploy path is `8099/deploy via git-proxy`; `8098 deploy-webhook` is legacy infrastructure context, not the decision primitive.
+
+## Product line
+
+```text
+Biological systems survive by sensing, verifying, remembering, and acting through constrained channels.
+fable-agent applies that pattern to agent work: scan, verify, attest, and only then deploy.
+```