chore: update AGENTS.md

chore: update AGENTS.md

refactor(snap): remove redundant CodingKeys raw values in Runtime

refactor(core): remove redundant delegate: nil parameter from URLSession data call

chore: add changelog item

refactor(asc): simplify Filter argument parsing by removing redundant guards

fix(core): remove force unwrap when constructing FCM token URL

chore(deps): bump Engine 0.3.1

refactor(agents): add PR instructions to AGENTS.md

chore: add changelog item

fix(snap): restore working directory via defer to guarantee cleanup on error

fix(snap): fix typos quater -> quarter and threeQuater -> threeQuarter

chore: add changelog item

fix(asc): validate key file path exists before registering

chore: add changelog item