feat(governance): v0.0.30 — submit_proposal + cast_vote + finalize_proposal impl complete + mock runtime integration tests E2E (10 scenarios)

Phase 5.1 GOVERNANCE pallet REAL IMPL canonical. Full dispatchables canonical
7+6+5 step CHN-4 flow + storage assertions + tally + voting period enforcement
+ mock runtime + 10 integration tests E2E pattern v0.0.26 mirror.

## Real dispatchables canonical

- submit_proposal (7 steps): ensure_signed + stake>=MIN + derive_id BLAKE2-256 + collision + build + insert + emit
- cast_vote (6 steps): ensure_signed + get_proposal + status_voting + block<=end + !already_voted + update_tally + emit
- finalize_proposal (5 steps): ensure_signed + get_proposal + status_voting + block>end + tally + status + emit

## Mock runtime + 10 integration tests E2E canonical

- scenario_1: Submit happy path → stored + event
- scenario_2: Stake insufficient → StakeInsufficient (CHN-4 5.3)
- scenario_3: Vote Aye tally → yes_weight += 500
- scenario_4: Vote Nay tally → nay_weight += 750
- scenario_5: Double vote → AlreadyVoted
- scenario_6: Finalize voting open → VotingPeriodOpen
- scenario_7: Finalize Approved yes majority → status=Approved + event
- scenario_8: Finalize Rejected nay majority → status=Rejected
- scenario_9: Vote closed period → VotingPeriodClosed
- scenario_10: Full lifecycle (submit → 3 votes → finalize Approved)

## Files

- EDIT: crates/origin-chain-governance/src/lib.rs (real impl + MIN_PROPOSAL_STAKE + account_bytes helper)
- NEW: crates/origin-chain-governance/src/mock.rs (85 LOC mock runtime)
- NEW: crates/origin-chain-governance/src/tests_integration.rs (290 LOC, 10 tests)
- EDIT: CHANGELOG.md (v0.0.30 entry)

## Verification

- cargo test -p origin-chain-governance — 17 tests verde, 0 failures
  (10 integration + 5 standalone + 2 auto-generated)

🛠️ Phase 5.1 real impl canonical. Runtime API v0.0.31 next → Phase 5 FOUNDATION COMPLETE.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

CHANGELOG.md

@@ -6,6 +6,62 @@ by [Keep a Changelog](https://keepachangelog.com/en/1.1.0/). Versions follow
 
 ## [Unreleased]
 
+## [0.0.30] — 2026-05-25 — Phase 5.1 impl — Real submit_proposal + cast_vote + finalize_proposal + mock runtime integration tests E2E (10 scenarios)
+
+**🛠️ Phase 5.1 GOVERNANCE pallet REAL IMPL canonical** — Full canonical
+dispatchables real impl + storage assertions + tally logic + voting period
+enforcement + mock runtime + 10 integration tests E2E pattern v0.0.26 mirror.
+
+### Deliverables v0.0.30
+
+**Real dispatchables canonical 7+6+5 step CHN-4 flow**:
+
+`submit_proposal` (7 steps): ensure_signed + validate stake >= MIN_PROPOSAL_STAKE (1,000 OGC) + derive_proposal_id BLAKE2-256 + collision check + build Proposal + insert + emit ProposalSubmitted
+
+`cast_vote` (6 steps): ensure_signed + get_proposal + status==Voting + block.number<=end_block + !already_voted + update tally + insert Votes + emit VoteCast
+
+`finalize_proposal` (5 steps): ensure_signed + get_proposal + status==Voting + block.number>end_block + tally final_status (yes_weight > nay_weight → Approved, else Rejected) + insert + emit ProposalFinalized
+
+**Mock runtime canonical (NEW file)**:
+- `crates/origin-chain-governance/src/mock.rs` — 85 LOC pattern v0.0.26 mirror
+- `construct_runtime!`: `System` + `Governance`
+- Helpers: `alice/bob/charlie_origin + _account` + `run_to_block` for voting period testing
+
+**Integration tests canonical E2E (NEW file)**:
+- `crates/origin-chain-governance/src/tests_integration.rs` — 290 LOC, **10 tests verde canonical**
+
+**10 integration tests CHN-4 flow canonical**:
+
+| # | Scenario | Expected |
+|---|----------|----------|
+| 1 | Submit proposal happy path | ✅ Stored + event emitted |
+| 2 | Stake insufficient | ❌ StakeInsufficient (CHN-4 5.3) |
+| 3 | Vote Aye tally updated | ✅ yes_weight += 500 |
+| 4 | Vote Nay tally updated | ✅ nay_weight += 750 |
+| 5 | Double vote same account | ❌ AlreadyVoted |
+| 6 | Finalize voting open | ❌ VotingPeriodOpen |
+| 7 | Finalize Approved (yes majority) | ✅ status=Approved + event |
+| 8 | Finalize Rejected (nay majority) | ✅ status=Rejected |
+| 9 | Vote closed period | ❌ VotingPeriodClosed |
+| 10 | Full lifecycle walkthrough | ✅ submit → 3 votes → finalize Approved |
+
+**Helper canonical**:
+- `MIN_PROPOSAL_STAKE = 1_000 × 10^18` constant per CHN-4 5.3
+- `account_bytes<T>` private helper convert T::AccountId → [u8; 32]
+
+### Verification end-to-end canonical
+
+- ✅ `cargo test -p origin-chain-governance` — **17 tests verde, 0 failures**:
+  - 10 integration tests E2E
+  - 5 standalone tests (compiles + derive_proposal_id deterministic + variants + re-export)
+  - 2 auto-generated (mock genesis + runtime integrity)
+
+### Roadmap canonical post-v0.0.30
+
+| Version | Trigger |
+|---------|---------|
+| **v0.0.31** | **Runtime API canonical GovernanceApi impl en runtime → Phase 5.1 FOUNDATION COMPLETE** |
+
 ## [0.0.29] — 2026-05-25 — Phase 5.1 wired — Governance pallet runtime composition Index 10
 
 **🔌 Phase 5.1 GOVERNANCE pallet WIRED runtime composition canonical** —