* tests: adds builder simulation test harness

- adds a builder test harness for simulating blocks that doesn't require network
access and doesn't use alloy for test setup
- adds test scenario helpers for future setup and use

* fmt

* chore: update claude workflows to run fmt and clippy

* fmt and clippy

* fix: add state source type support

* refactor: pull integration tests back into tests/ and gate test_utils behind`#[cfg(test)]`

* docs: update docs to match testing changes

* fmt + clippy recrusion limits fix

* cleanup: gate individual test files behind test-utils

* cleanup: remove redundant rust version info

* fix: make ci only run unit tests

Adds a Claude Code hook that runs before every `git push`:
- make fmt
- make clippy (with -D warnings)
- RUSTDOCFLAGS="-D warnings" cargo doc

Clippy and doc warnings are hard failures that block the push.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

# tests: add load tests to the cache ingestion and simulation loop 

Per discussions with @Fraser999 I load tested the builder simulation loop and was able to reproduce the same error they saw - the build function deadlocks over some limit of bundles, which also prevents the simulation deadline from being respected. 

![image.png](https://app.graphite.com/user-attachments/assets/05e096cc-ec36-4d45-822f-a4754effc441.png)

The screenshot shows the test running and taking over 60 seconds, but with the deadline configured for 12 seconds, which should terminate the build loop and return a block with `tx_count > 0`.

#235)

* feat(bundle): filter bundles with stale host tx nonces before SimCache

Adds nonce checking for host transactions in BundlePoller, similar to the
existing TxPoller pattern. Bundles with stale host tx nonces are dropped
before entering SimCache to prevent:

- Wasted simulation cycles on bundles that will fail
- ERROR log spam from nonce-too-low failures
- Re-ingestion churn (~1s poll cycle)

Each host transaction's nonce is compared against the sender's current
nonce from the host provider. If any host tx has a stale nonce, the
entire bundle is dropped with DEBUG-level logging.

Closes ENG-1937

* refactor: use FuturesUnordered and reuse validity checks

- Refactored bundle processing to use FuturesUnordered for concurrent execution
- Added cancellation on first failure
- Reused validity checks from crates/sim/src/cache/item.rs

Addresses PR review feedback from prestwich

* address review feedback

* use check_bundle_tx_list from sdk

* address review comments

---------

Co-authored-by: Fraser Hutchison <190532+Fraser999@users.noreply.github.com>