Merge upstream staging into contracts

Bring the branch current with upstream staging (= master + #748). The earlier
"Merge branch master into contracts" used a stale local master snapshot, which
left the branch ~41 commits behind; this merges the current tip, including the
grin 5.4.0 dependency bump (#745) and the tx-delete / retrieve_txs fixes.

Only Cargo.lock conflicted (regenerated). Full cargo test --workspace green
(52 binaries / 185 tests).

controller/src/command.rs

@@ -77,6 +77,7 @@ pub struct InitArgs {
 	pub restore: bool,
 }
 
+/// Write config (default if None), initiate the wallet
 pub fn init<L, C, K>(
 	owner_api: &mut Owner<L, C, K>,
 	_g_args: &GlobalArgs,