Organize generic docs and Coulomb MVP project layout

Move the framework PRD from specs/ to docs/ and remove the misplaced
specs/ directory. Document repository layout in AGENTS.md and SCOPE.md:
generic material in docs/, project-specific MVP artifacts in
projects/coulomb-pricing/, execution tracking in workplans/.

SCOPE.md

@@ -0,0 +1,38 @@
+# SCOPE
+
+> This file was generated by `statehub register`. Refine it as the repository
+> boundaries become clearer.
+
+## One-liner
+
+Auto-regulating market value exploring price engine.
+
+## Core Idea
+
+adaptive-pricing exists to provide the capability described in INTENT.md.
+
+## In Scope
+
+- Maintain the repository's primary implementation.
+- Keep docs, tests, and operational metadata current.
+- Generic framework documentation (`INTENT.md`, `docs/`, `research/`, `registry/`).
+- Project-specific deployments under `projects/<slug>/`.
+
+## Out of Scope
+
+- Own unrelated adjacent systems.
+- Make irreversible operational decisions without human approval.
+- Project-specific MVP material in `specs/` or other generic doc paths (use
+  `projects/<slug>/` instead).
+
+## Current State
+
+- Status: active; implementation and stability should be verified by the repo agent.
+
+## Getting Oriented
+
+- Start with: INTENT.md
+- Product requirements (generic): docs/ProductRequirementsDocument.md
+- Agent instructions: AGENTS.md
+- Workplans: workplans/
+- Coulomb MVP artifacts: projects/coulomb-pricing/