ruflo-knowledge-graph plugin contract — pinning, namespace coordination, embeddings_generate fix, smoke as contract

Context

ruflo-knowledge-graph (v0.2.0) — entity extraction + relation mapping + pathfinder graph traversal. Surface: 1 agent + 2 skills + 1 command (5 subcommands). Backed by agentdb_hierarchical-* (entity tree), agentdb_causal-edge (relation tracking), agentdb_semantic-route (query routing), and embeddings_* (entity description embeddings).

The drift this ADR fixes

Two files reference mcp__claude-flow__embeddings_embed, but the real tool is embeddings_generate (v3/@claude-flow/cli/src/mcp-tools/embeddings-tools.ts:260). There is no embeddings_embed MCP tool.

• skills/kg-extract/SKILL.md:5 — allowed-tools line includes the wrong tool name
• agents/graph-navigator.md:56 — agent's tool list also wrong

This is a real bug: invocations would fail with "tool not found". Fixing in this ADR pass.

Other gaps

1. No plugin-level ADR.
2. No smoke test.
3. No Compatibility section.
4. No namespace coordination cross-reference (uses graph storage but no explicit namespace claim).

Decision

1. Functional fix: rename embeddings_embed → embeddings_generate in both files.
2. Add this ADR (Proposed).
3. README augment: Compatibility (pin v3.6); Namespace coordination (claims kg-graph); Verification + Architecture Decisions sections.
4. Plugin metadata stays at 0.2.0 (already at the cadence). Patch bump justified by the functional fix (rename of a referenced tool name) but cadence keeps it at minor for consistency. Keywords add mcp, pathfinder-traversal, entity-extraction.
5. scripts/smoke.sh — 10 structural checks: version + keywords; both skills + agent + command with valid frontmatter; no reference to embeddings_embed anywhere (regression check on the bug fix); embeddings_generate referenced; 5 subcommands documented; v3.6 pin; namespace coordination; ADR Proposed; no wildcard tools.

Consequences

Positive:

• Real bug fixed: kg-extract skill no longer references a non-existent MCP tool.
• Plugin joins the cadence.

Negative:

• Anyone scripting against the old (broken) tool name was already silently failing. Net zero on real impact.

Verification

bash plugins/ruflo-knowledge-graph/scripts/smoke.sh
# Expected: "10 passed, 0 failed"

Related

• plugins/ruflo-agentdb/docs/adrs/0001-agentdb-optimization.md — namespace convention
• plugins/ruflo-cost-tracker/docs/adrs/0001-cost-tracker-contract.md — sibling pattern of fixing real MCP-tool drift in skills
• v3/@claude-flow/cli/src/mcp-tools/embeddings-tools.ts:260 — embeddings_generate (the real tool name)