Adds a CITATION file as per user request.

Update bridges.md

specs: Fix typo & link in withdrawals section

Remove node built in from sdk

feat(mon): Add withdrawal monitor to chain-mon

chore(op-node): Fix two typos

chore(deps): bump http-cache-semantics from 4.1.0 to 4.1.1

fix(spec): Add missing call to engine_newPayload

The process to create a new block via the engine API only returns the block and doesn't import it.
So an explicit call to engine_newPayload is required to import the payload before making it canonical.
The actual code performs this call, but it was missed in the spec description.

fix(spec): Withdrawal calls are not forwarded during the proof verification call

The spec incorrectly stated that the call was forwarded at both the proof verification call and during the finalization call.

Bumps [http-cache-semantics](https://github.com/kornelski/http-cache-semantics) from 4.1.0 to 4.1.1.
- [Release notes](https://github.com/kornelski/http-cache-semantics/releases)
- [Commits](https://github.com/kornelski/http-cache-semantics/compare/v4.1.0...v4.1.1)

---
updated-dependencies:
- dependency-name: http-cache-semantics
  dependency-type: indirect
...
Signed-off-by: dependabot[bot] <support@github.com>

txmgr: Flatten + simplify

op-heartbeat: fix formatting

op-node: Remove duplicated word in comment.

op-heartbeat: allow more versions in heartbeat service

test(ctb): Add bridge tests for the new bridge interface

[op-node] Fix ReadStorageAt for 0-prefixed values

chore(ctb): Add comments, rebuild

fix(ctb): Refactor and fix the L2 bridge tests

fix(ctb): Ensure consistent event ordering using super

The _emit methods in child contracts now use super to
call emit the new events.
The legacy events now always precedes the new event.

test(ctb): Use kwargs syntax in _preBridgeX() funcs

chore(ctb): Improve doc comments on _emit funcs

fix(ctb): Add _emitETHBridgeInitiated

fix(ctb): Add _emitERC20BridgeFinalized

fix(ctb): Add remaining event wrapper functions

ctp: remove final hh tests