chore: scaffold PYRE MVP monorepo (structure + docs)

pnpm + TypeScript workspace per design doc §13:
- apps/{web,api,worker} skeletons (Next.js 16, Fastify 5, BullMQ)
- packages/{core,solana,prometheus,db,config} (core has real types/DTOs;
  solana/prometheus are stubs)
- programs/pyre-core placeholder (future Anchor, v1.0)
- docs/: PYRE_MVP_DESIGN (canonical), ARCHITECTURE, SECURITY, TOKEN_CLASSIFICATION
- CLAUDE.md, README, .env.example (no private-key var by design)

Skeleton + docs only — no Solana/business logic yet. All workspaces typecheck clean.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

programs/pyre-core/README.md

@@ -0,0 +1,24 @@
+# programs/pyre-core
+
+**Future** Anchor (Solana) program for trust-critical, on-chain accounting.
+
+> **Not needed for the first burner MVP (v0.1–v0.4).** This directory is a
+> placeholder. The PYRE Core Program lands in **MVP v1.0** (see
+> [`docs/PYRE_MVP_DESIGN.md`](../../docs/PYRE_MVP_DESIGN.md) §5, §18 Phase 7).
+
+## Planned program responsibilities (v1.0)
+
+- create round
+- accept Essence
+- hold Essence vault
+- record contribution receipts (receipt PDA)
+- lock round
+- register Spawn mint
+- open claims
+- distribute Spawn pro rata
+- support refunds for failed rounds
+- prevent double claims
+
+Until on-chain custody exists: do **not** call contributions a "deposit" and do
+**not** promise claims. Off-chain Essence accounting (Phase 6) stays explicitly
+experimental.