feat(dao): wire 8 dao_* MCP tools (Phase 1)

Tools added to WalletService:

DAO management (filesystem-only, no chain calls):
- dao_register      — save a DaoConfig under \$ALDABRA_DATA/daos/<name>.json
- dao_list          — show all registered DAO names + active marker
- dao_use           — set active DAO; subsequent dao_* calls without
                      explicit `dao` arg target this one
- dao_remove        — delete config; clears active if it was the active one
- dao_show          — render full DaoConfig JSON for audit

DAO live-state reads (Koios-backed, decoded into typed Rust):
- dao_governor_state  — singleton governor UTxO + thresholds + timing
                        + nextProposalId + per-stake proposal cap
- dao_stake_list      — all stakes for the DAO (filtered to gov-token
                        policy so the shared MLabs stakes addr doesn't
                        leak other DAOs into output). Renders pkh,
                        amount, locks, delegation per stake.
- dao_my_stake        — filters dao_stake_list to just THIS wallet's
                        stake (matches wallet pkh against StakeDatum.owner).
                        Empty array if not staked yet.

Plumbing:
- WalletService::new gains data_dir param (for DaoStore root)
- WalletInner gains dao_store + dao_reader fields
- wallet_pkh() helper extracts the wallet's payment-credential hash from
  bech32 for owner-match in dao_my_stake
- get_info() instructions advertise the new dao_* surface
- aldabra-mcp/Cargo.toml: aldabra-dao path dep + hex + pallas-addresses

crates/aldabra-mcp/Cargo.toml

@@ -20,6 +20,15 @@ path = "src/main.rs"
 [dependencies]
 aldabra-core = { path = "../aldabra-core" }
 aldabra-chain = { path = "../aldabra-chain" }
+aldabra-dao = { path = "../aldabra-dao" }
+
+# Used directly in tools.rs to decode the wallet's bech32 address into a
+# payment-credential hash (so `dao_my_stake` can match against StakeDatum.owner).
+# Comes in transitively via aldabra-core too; declared here for clarity.
+pallas-addresses = { workspace = true }
+
+# `hex::encode` for rendering pkh/script-hash bytes in dao_* JSON output.
+hex = "0.4"
 
 tokio = { workspace = true }
 anyhow = { workspace = true }