Drop the localnet-tests feature gate: the generated clients are the algod/
indexer/kmd clients, so exercising them against a live node is core coverage,
not an opt-in extra. The endpoint tests now compile and run as part of cargo t,
which assumes a running, seeded localnet. sanity.sh and CI seed localnet
(cargo api seed-localnet) before cargo t. Deferred tests keep their #[ignore].

Replace the per-test #[ignore = "requires localnet"] with a localnet-tests
cargo feature: the generated aggregator is #![cfg]'d off by default so offline
cargo t stays green, and enabling the feature against a seeded localnet runs the
suite. Deferred tests keep their own #[ignore]. state_lock() moves to an async
tokio::sync::Mutex so its guard is safe to hold across the awaits it guards.

seed_localnet + the seed-localnet binary create a shared asset, app, and
confirmed payment on localnet and write their ids to a gitignored manifest the
endpoint tests read. Seeding also guarantees a block exists for the
block-dependent and /ready tests. Verified end-to-end against localnet.

Address serialized only as raw bytes, so the JSON algod REST API (which sends
base32 strings) failed to decode into models like Account. Serialize now keys
off is_human_readable(); deserialize dispatches on the arriving value via a
visitor (string / bytes / byte-seq), since is_human_readable() is unreliable
inside serde's buffered internally-tagged Transaction enum decoding. Adds JSON
and msgpack round-trip tests.

Implement the endpoints that need no chain state: status, genesis, versions,
supply, transaction params, and health. Each calls the typed client method
and validates the raw response against the algod OpenAPI schema. All #[ignore]'d;
verified live against localnet.

Add a LocalnetFixture that recovers a funded, signable account from the
default KMD wallet (list wallets -> open handle -> list keys -> export key),
plus helpers to build/sign/submit payments and wait for confirmation. Signing
goes through algokit_crypto's ed25519 keypair and algokit_transact's signer.
Compile-verified; exercised live in the heavy-seed endpoint tests.

New shared crate holding a capturing HTTP client (records raw response
bytes) and a jsonschema validator that checks those bytes against the algod
OpenAPI response schemas. Wired as a dev-dependency in the client Cargo.toml
template so it survives client regeneration; the dev-dep cycle is dev-only
and Cargo-legal. Keeps the harness separate from the dep-free
algokit_test_artifacts crate to avoid pulling clients into low-level test builds.

Add a polytest section to api/README.md covering cargo api polytest-algod /
polytest-validate-algod, shared across the client crates (indexer/kmd follow).

cargo api polytest-algod clones the upstream polytest catalog via --git,
generates the rust endpoint stubs into crates/algod_client/tests/generated/,
writes a tests/generated.rs aggregator so cargo test discovers them, and
formats. polytest-validate-algod checks catalog<->file parity.

polytest 0.8.1 drops TOML config support, so convert the transact and
composer plans to .jsonc (1:1, add version field) and regenerate their
markdown test plans with the 0.8.1 template.