fix(ci): skip commit-subject validation in the post-merge pipeline

[bougyman]

Summary

Closes #40.

main.yaml's validate job calls ci.yaml as a reusable workflow, running both Test and Validate Commit Subjects post-merge. The commit-subject check only makes sense pre-merge (should this PR be mergeable) - by the time main.yaml runs, the commits are already merged, so re-checking their subjects is meaningless. Test still re-runs post-merge (verifies the actual merge result); commit-subject validation no longer does.

Added a skip_commit_validation workflow_call input on ci.yaml (default false, so its own pull_request/workflow_dispatch triggers are unaffected), and main.yaml's validate job now passes skip_commit_validation: true.

Test plan

• Both edited workflow files validated with ruby -ryaml
• Confirmed the if: inputs.skip_commit_validation != true expression safely defaults to running the job for every trigger type that doesn't explicitly pass the input (pull_request, workflow_dispatch) - inputs.skip_commit_validation evaluates to null there, and null != true is true

[Copilot]

Pull request overview

Updates the post-merge workflow (main.yaml) to avoid re-running commit-subject validation after a PR is already merged, while keeping the reusable CI workflow (ci.yaml) behavior unchanged for its normal pre-merge triggers.

Changes:

• Add a skip_commit_validation boolean input to the reusable CI workflow (ci.yaml) with a default of false.
• Gate the “Validate Commit Subjects” job in ci.yaml behind if: inputs.skip_commit_validation != true.
• Pass skip_commit_validation: true from main.yaml when invoking the reusable CI workflow post-merge.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
.github/workflows/main.yaml	Passes skip_commit_validation: true when calling the reusable CI workflow in the post-merge validations job.
.github/workflows/ci.yaml	Introduces a workflow_call input and uses it to conditionally skip the commit-subject validation job.

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