feat(types): Phase 2/3 prep — 3 custom Charon pallet traits v0.0.3

Day 1 unblock surface extended con custom pallet traits para Phase 2-3 work
all Substrate-free (no Substrate deps pulled yet, that's Phase 1.2).

## New trait surface (origin-chain-types::pallets)

### OriginProvenance (Phase 2.1, CHN-7)
- attest_validator_signed: institutional/Foundation wallet attestation
- batch_attest: bounded 64-item batch (Pi 5 block-weight aware)
- provenance_exists: cheap duplicate-check query (no full fetch)

### OriginFees (Phase 2.4, CHN-8)
- fee_for_extrinsic: storage-aware fee computation (uses tier_assertion)
- estimate_fee: pure off-chain RPC dry-run helper
- burn_basis_points: per-operation burn rate canonical (CHN-2 matrix)

### OriginValidatorEconomy (Phase 3.5, CHN-3)
- distribute_rewards: epoch-based pro-rata desde 40% Ecosystem Pool
- slash_validator: SlashReason taxonomy canonical
- validator_commission_bps: nominator delegation read

### SlashReason enum
- Downtime | DoubleSign | Equivocation | TierFraud
- TierFraud variant enforces Inmutable #16 anti-clasista ON-CHAIN

## Workspace stats
- 46 tests passing (was 44, +3 SlashReason serde + distinctness +
  inmutable_16 enforcement)
- Build release clean
- origin-chain-runtime re-exports extended

Refs: CHN-3/7/8, Phase 2.1/2.4/3.5 of CHARON_ROADMAP_V1, Inmutable #16

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

crates/origin-chain-runtime/src/lib.rs

@@ -39,7 +39,8 @@
 pub use origin_chain_types::{
     AccountId, AssetAttestation, AssetHash, AssetQualityTier, BridgeDestination, ChainBridge,
     ChainError, FeeCalculator, ForeignTxId, GovernanceProposal, HardwareTier, Ogc, OgcLedger,
-    OperationKind, ProposalId, ProvenanceLedger, Signature, Vote, VoteStance,
+    OperationKind, OriginFees, OriginProvenance, OriginValidatorEconomy, ProposalId,
+    ProvenanceLedger, Signature, SlashReason, Vote, VoteStance,
 };
 
 /// Canonical runtime configuration. Substrate `Config` traits implement when