refactor: make coordinator the main workflow agent

.codex/skills/fesa-research-evidence/SKILL.md

@@ -13,8 +13,7 @@ Read these first:
 
 - `AGENTS.md`
 - `docs/SOLVER_AGENT_DESIGN.md`
-- `docs/research/README.md`
-- `docs/requirements/<feature-id>.md`
+- `docs/<feature-id>/requirements.md`
 - User-supplied books, papers, manuals, or benchmark constraints
 
 ## Workflow
@@ -29,7 +28,7 @@ Read these first:
 
 ## Output Contract
 
-Produce or revise `docs/research/<feature-id>-research.md` with:
+Produce or revise `docs/<feature-id>/research.md` with:
 
 - Metadata and source requirement path
 - Research Questions
@@ -55,7 +54,8 @@ Produce or revise `docs/research/<feature-id>-research.md` with:
 - Benchmark candidates include what quantity they can verify and what they cannot verify.
 - Missing source evidence is carried forward as an open issue.
 - No reference value, tolerance, or compatibility claim is invented.
+- Benchmark/reference evidence identifies exact candidate artifacts, target quantities, applicability limits, and unresolved acceptance questions for Numerical Review.
 
 ## Handoff
 
-Send formulation evidence to Formulation Agent, benchmark and source limits to Numerical Review Agent, artifact candidates to Reference Model Agent, and unresolved source gaps to Coordinator Agent.
+Return `docs/<feature-id>/research.md`, status, evidence summary, and blockers to Coordinator Agent. Route formulation evidence to Formulation Agent and benchmark/reference evidence, artifact candidates, and source limits to Numerical Review Agent through Coordinator Agent.