rename: aldabra → aldabra (per Sulkta 2026-05-04)

Aldabra giant tortoise (Aldabrachelys gigantea) — endemic to the
Aldabra atoll, up to 250 kg, 150-year lifespan. Long-lived,
defended, slow but unstoppable. Better metaphor for the wallet
than 'aldabra' which was on-the-tin descriptive.

All renames in one pass:
- repo: Sulkta-Coop/aldabra → Sulkta-Coop/aldabra (via gitea API)
- workspace dir: aldabra → aldabra
- crate dirs: wallet-{core,chain,mcp} → aldabra-{core,chain,mcp}
- crate names + path imports in Cargo.toml workspace + each crate
- binary name: aldabra → aldabra
- README, ROADMAP, docs/architecture: all references swept

crates/wallet-chain/Cargo.toml

@@ -1,23 +0,0 @@
-# wallet-chain — pluggable backends for chain queries.
-#
-# A `ChainBackend` trait abstracts over Koios (HTTPS), Ogmios (WS/HTTP),
-# or any future option. Phase 1 ships with a Koios implementation since
-# Sulkta already runs Koios endpoints.
-#
-# Submission paths land in phase 2. Read-only queries first.
-
-[package]
-name = "wallet-chain"
-version.workspace = true
-edition.workspace = true
-license-file.workspace = true
-repository.workspace = true
-authors.workspace = true
-
-[dependencies]
-tokio = { workspace = true }
-reqwest = { workspace = true }
-serde = { workspace = true }
-serde_json = { workspace = true }
-thiserror = { workspace = true }
-async-trait = "0.1"