feat(admin): close GAP btcli.sudo.senate-vote

[unarbos]

Summary

• added a governance-specific admin raw --call senate-vote alias that maps to SubtensorModule.vote
• implemented proposal hash + vote parsing (yes/no, aye/nay, true/false, 1/0) and proposal index lookup from Triumvirate.Voting
• added new chain helpers for Triumvirate vote data/proposals lookup and senate vote submission
• added parity test wiring under tests/parity/ and updated admin command docs + parity matrix row

Parity mapping

• row: btcli.sudo.senate-vote
• status: GAP -> COVERED_E2E
• agcli path: agcli admin raw --call senate-vote --args '["0x<proposal_hash>","yes"]' --sudo-key //Alice --yes --output json

Verification

• SKIP_METADATA_FETCH=1 cargo build --release --bin agcli ✅
• SKIP_METADATA_FETCH=1 cargo test --features e2e parse_senate_vote_args -- --nocapture ✅
• SKIP_METADATA_FETCH=1 cargo test --features e2e --test parity -- --nocapture ✅ (test runs and skips on runtimes without Triumvirate pallet)
• SKIP_METADATA_FETCH=1 cargo test --features e2e -- --nocapture ⚠️ baseline failure unrelated to this change: events::tests::pretty_subtensor_variants_are_exhaustive

Notes

• the localnet runtime in this VM reports Triumvirate missing, so the new parity test intentionally exits early with a skip message in that environment while still validating the executable path and preserving the write-path assertion logic for governance-enabled runtimes.