Bump sn-forge 0.59 -> 0.63 & scarb 2.15.1 -> 2.18.0

[remollemo]

This change is 

[cursor]

PR Summary

High Risk
Changes governance-style delayed execution semantics, public interfaces (salt parameter), and multisig timer/deadline behavior—integrators and deployed callers must update calldata and expectations.

Overview
Toolchain: CI, .tool-versions, and workspace deps move to Scarb 2.18.0 and starknet-foundry 0.63.0 (plus voyager in asdf). Account package test class hashes and EIP-712 fixture signatures are refreshed for the new compiler.

Delayed executor — breaking API: submit_calls / exec_calls now take a salt; call-set keys are poseidon(serialize(calls) ++ [salt]), so identical batches can be queued concurrently with different salts (0 is the usual default).

Submission semantics: DelayedExecutor no longer treats re-submit while Pending/Ready as a no-op — it reverts with ALREADY_SUBMITTED. MultiExecutor reverts ALREADY_SIGNED_BY_CALLER instead of idempotent return (slot-based, including inherited signatures after ownership transfer).

MultiExecutor timers: Delay timer is write-once (retracting below threshold does not reset it; only full withdrawal to zero clears timers). Expiration is set on first signature and re-anchored once at the first threshold crossing, emitting CallSetTimerStarted. Constructor requires execution_expiration > execution_delay (EXPIRATION_BELOW_DELAY).

Other: MultiOwned rejects the contract’s own address as an owner (SELF_AS_OWNER). DelayedExecutor returns real allowed_time for Expired sets. SPEC.md documents the new behavior.

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[codecov]

Codecov Report

❌ Patch coverage is 99.82047% with 1 line in your changes missing coverage. Please review.
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Files with missing lines	Patch %	Lines
...ages/delayed_executor/tests/test_multi_owned.cairo	92.85%	1 Missing ⚠️

Additional details and impacted files

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[noa-starkware]

@noa-starkware made 1 comment.
Reviewable status: 0 of 7 files reviewed, all discussions resolved (waiting on remollemo).

[remollemo]

@remollemo reviewed 7 files and all commit messages.
Reviewable status: 0 of 7 files reviewed, all discussions resolved (waiting on remollemo).

[remollemo]

@remollemo reviewed 8 files and all commit messages.
Reviewable status: 0 of 15 files reviewed, all discussions resolved (waiting on remollemo).