docs: add native memory help pack and enforce workflow in AGENTS

help/memory/memory_fabric_workflow.txt

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+# Memory Fabric Workflow (bd-native)
+
+Goal: keep memory durable, queryable, and behavior-changing without graph noise.
+
+Core model:
+1. Domain Anchors (open epic)
+- Purpose: index and discovery root per domain
+- Labels: memory,memory-anchor,<domain>
+- Example domains: memory-arch,memory-workflow,memory-ux,memory-agent,memory-reliability
+
+2. Canonical Memory Nodes (closed decision)
+- Purpose: ratified reusable rules/patterns
+- Labels: memory,mem-canonical,mem-hard|mem-soft,<domain>
+- Lifecycle: create -> ratify -> close
+
+3. Execution Contracts (open task or decision)
+- Purpose: temporary enforcement wrapper for hard constraints only
+- Labels: memory-contract,mem-hard,<domain>
+- Lifecycle: attach to active work while unresolved, close when satisfied
+
+Required lifecycle:
+1) Propose memory node
+- Create as decision bead using strict template fields (Scope, Out of Scope, Rule, Rationale, Failure Mode)
+
+2) Ratify memory node
+- Add acceptance checks and metadata JSON
+- Close with explicit reason: Ratified canonical memory
+
+3) Index memory node
+- Relate canonical node to exactly one primary domain anchor
+  bd dep relate <anchor-id> <memory-id>
+
+4) Inject memory into execution
+- At task start, query by domain and attach relevant nodes via relates_to
+- Promote only mem-hard constraints to blocker contracts
+
+5) Evolve memory safely
+- Do not rewrite historical canonical truth
+- Create a new canonical node and link lineage:
+  bd supersede <old-memory-id> --with <new-memory-id>
+
+Non-negotiables:
+- No direct writes to .beads/issues.jsonl
+- No markdown-only memory source of truth
+- No blanket blocker links for all memories
+- Evidence before completion claims