starknet_os_flow_tests: measure OS linear syscall resources with many…

[dorimedini-starkware]

… elements

[cursor]

PR Summary

Low Risk
Changes only affect OS flow regression tests and the measurement contract; no production fee or execution logic.

Overview
Improves OS syscall linear-cost measurement by using 100 extra calldata elements instead of a single-element delta when comparing paired syscall invocations.

The Cairo os_resources_test_contract now builds a large_input array (length prefix + 100 felts) and passes it to the second meta_tx_v0_syscall and deploy_syscall calls that exercise the linear factor. The os_resources_regression test divides the resource difference between the two measurements by LARGE_INPUT_LENGTH via div_ceil, and the inline docs describe the new M1 / M2 measurement model and BASE = M1 - LINEAR adjustment.

^{Reviewed by Cursor Bugbot for commit a9d1d3f. Bugbot is set up for automated code reviews on this repo. Configure here.}

[reviewable-StarkWare]

This change is 

[Yoni-Starkware]

@Yoni-Starkware reviewed 2 files and all commit messages, and made 2 comments.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on dorimedini-starkware).

---

crates/blockifier_test_utils/resources/feature_contracts/cairo1/os_resources_test_contract.cairo line 54 at r1 (raw file):

        let mut large_input: Array<felt252> = array![LARGE_INPUT_LENGTH.into()];
        for _ in 0..LARGE_INPUT_LENGTH {
            large_input.append(1);

It's 0 in your documentation. Fix one of the

Code quote:

 large_input.append(1);

[dorimedini-starkware]

@dorimedini-starkware resolved 1 discussion.
Reviewable status: 1 of 2 files reviewed, all discussions resolved (waiting on Yoni-Starkware).

[dorimedini-starkware]

@dorimedini-starkware reviewed 2 files and all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on dorimedini-starkware).

[Yoni-Starkware]

@Yoni-Starkware reviewed 1 file and all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on dorimedini-starkware).