circuit breaker pool extension

[moodysalem]

Add circuit breaker Ekubo extension with black-swan swap protection

[Copilot]

Pull request overview

Adds a new CircuitBreaker pool extension intended to pause swaps after large within-block tick movement (“black swan” protection), along with supporting packed state + helper library and a dedicated test suite (including a gas snapshot).

Changes:

• Introduces CircuitBreaker extension with beforeInitializePool, beforeSwap, and afterSwap hooks to enforce tick-movement limits and halting.
• Adds CircuitBreakerPoolState packed type + CircuitBreakerLib helper functions for reading state and determining fuse status.
• Adds CircuitBreaker.t.sol tests and a snapshot entry for swap gas measurement.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/extensions/CircuitBreaker.sol	Implements circuit breaker extension logic and storage for per-pool state.
src/types/circuitBreakerPoolState.sol	Adds packed state encoding/decoding helpers for last swap timestamp + block start tick.
src/libraries/CircuitBreakerLib.sol	Adds convenience getters for pool state, reset time, elapsed time, and fuse-tripped checks.
src/interfaces/extensions/ICircuitBreaker.sol	Defines extension interface (params + errors).
test/extensions/CircuitBreaker.t.sol	Adds tests covering registration, init, revert paths, fuse behavior, and gas snapshot.
snapshots/CircuitBreakerTest.json	Stores gas snapshot for a representative circuit-breaker swap scenario.

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[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

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[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

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[moodysalem]

@copilot apply changes based on the comments in this thread

[Copilot]

@copilot apply changes based on the comments in this thread

Applied the requested thread fixes in commit 1f00f35: constructor now rejects haltDuration == 0, CircuitBreakerLib.resetTime() now directly uses lastSwapTimestamp + HALT_DURATION, and the unused using CircuitBreakerLib for ICircuitBreaker; directive was removed from the test file.

[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

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[moodysalem]

@copilot fix the tests

[Copilot]

@copilot fix the tests

Fixed. Commit e8423b5 updates snapshots/CircuitBreakerTest.json so the circuit breaker gas snapshot matches current test output (94056 -> 93907), which resolves the CI test failure.