feat(workspace): Phase 0.4 — trait-first foundation v0.0.1

Charon sesión 1 (2026-05-19) — primer commit canonical.

Ships the Day 1 unblock surface so all hermanos can compile against Origin
Chain interfaces before Substrate runtime lands (Phase 1).

## origin-chain-types (CORE)
- ProvenanceLedger trait (CHN-7)
- OgcLedger trait (CHN-2)
- ChainBridge trait + BridgeDestination enum (CHN-5)
- GovernanceProposal trait + Vote + VoteStance (CHN-4)
- FeeCalculator trait + pure compute_fee() helper (CHN-8)
- Ogc newtype (18 decimals, 1B genesis hard cap)
- AccountId (Ed25519 32-byte) + Signature (Ed25519 64-byte via serde-big-array)
- AssetHash (BLAKE3 32-byte)
- HardwareTier mirror (Mathi canonical, per ADR-0057)
- AssetQualityTier (Standard | Hero) with gating + Hero surcharge
- ChainError canonical enum (cites Inmutables + CHN-* in messages)

## Stub crates (Phase 1+ scaffolding)
- origin-chain-consensus (Aura+GRANDPA PoA→NPoS, Phase 1)
- origin-coin-tokenomics (OGC + fee matrix + burns, Phase 1-2)
- origin-chain-provenance (asset attestation impl, Phase 2)
- origin-chain-bridges (Polkadot+Eth L2 export-first, Phase 7)
- origin-chain-governance (Foundation DAO, Phase 5)

## Tests: 41 passing (33 unit + 6 stub + 2 doctest)
- Fee math: 7 tests cover EmbeddedArm/Portable/Desktop/Ultra × Standard/Hero
  matrix from CHN-8, including anti-clasista Inmutable #16 enforcement
- Genesis supply: 1B OGC × 10^18 base units fits in u128 with 100x safety margin
- Type sizes: AccountId=32, Signature=64, AssetHash=32, ProposalId=32 canonical
- Serde roundtrips: AssetAttestation, BridgeDestination, VoteStance
- Cross-crate wiring: origin-coin-tokenomics consumes origin-chain-types::fees

## Coordination notes
- DC ORIGIN_CHAIN_FOUNDATION_V1 open in Palace KG (8 sub-decisions CHN-1..CHN-8)
  Proposer: Ergon (proxy — Charon hotfix shipped in Palace v0.9.0-α.5 same day)
  Co-authors: Larihana, Lyra, Mathi, Marihan, Phanes, Codex, Sussi, Palace
  Deadline: 2026-05-26
  1/9 signatures filed so far (Palace ✅ APPROVE 8/8)

Refs: CHN-1..CHN-8, Inmutables #16/#26/#37/#41, ADR-0057, CHARON_ROADMAP_V1

Co-Authored-By: Ergon (interim Pilar 4 author) <ergon@originmetaverse.com>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

crates/origin-coin-tokenomics/src/lib.rs

@@ -0,0 +1,62 @@
+//! # origin-coin-tokenomics
+//!
+//! $OGC token implementation per **CHN-2** + multi-tier fee matrix per **CHN-8** +
+//! multi-source burn enforcement per CHN-2/CHN-8. Stub crate in v0.0.1.
+//!
+//! ## Phase 1 milestones
+//!
+//! - 1.3 `pallet_balances` con OGC token (1B supply genesis)
+//! - 1.7 Genesis config: allocation 40/25/15/15/5 per BM V2
+//!
+//! ## Phase 2 milestones
+//!
+//! - 2.4 `fee_for_transaction(tier, quality) -> Ogc` implementation
+//! - 2.5 Fee matrix: EmbeddedArm 0.1×, Portable 0.3×, Desktop 1.0×, Ultra 0.7×
+//! - 2.6 Hero surcharge: Desktop +0.5×, Ultra +0.3×
+//!
+//! ## Canonical burn matrix
+//!
+//! Per CHN-2 + CHN-8 + Pillar 6/7 docs:
+//!
+//! | Source | Burn rate |
+//! |--------|-----------|
+//! | Gas fees | 100% |
+//! | Seeds Hosting payments | 20% |
+//! | Marketplace 9% Treasury share | 50% (2% del 9%) |
+//! | ONS registration | 50% |
+//! | OIT Oracle | 30% |
+//! | Escrow commissions | 20% |
+//! | Resonance slashing | 25% |
+//! | Ticket commissions | 30% |
+//! | Reputation stake slashing | 50% |
+//! | Ethos net revenue buy-back | 5% |
+
+#![deny(missing_docs)]
+
+/// Placeholder marker for the tokenomics module. Replaced by concrete pallet in Phase 1.3.
+#[derive(Debug, Clone, Copy, Default)]
+pub struct TokenomicsConfig;
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use origin_chain_types::fees::compute_fee;
+    use origin_chain_types::{AssetQualityTier, HardwareTier, Ogc};
+
+    // Sanity test: the trait crate's compute_fee returns canonical values.
+    // This proves the workspace dependency wires up correctly.
+    #[test]
+    fn cross_crate_fee_calculation_canonical() {
+        let fee = compute_fee(
+            Ogc::from_whole(10),
+            HardwareTier::EmbeddedArm,
+            AssetQualityTier::Standard,
+        );
+        assert_eq!(fee.as_base_units(), Ogc::from_whole(1).as_base_units());
+    }
+
+    #[test]
+    fn stub_crate_compiles() {
+        let _cfg = TokenomicsConfig;
+    }
+}