fix(guardrails): forward git globals through convention-violation alias hops

[kyle-sexton]

Fixes #2166.

Plain-alias recursion in block-convention-violation rebuilt argv through gi+1, dropping git's own locating globals between git and the subcommand. A mid-merge git -C inner qc -F - was content-gated in the payload repository instead of the moved-to one.

Change: splice through sub_idx (matching block-dangerous-git).

Tests: base-failing git -C inner qc sequencer case plus a no-MERGE_HEAD discriminator.

Related

Refs #2166

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[github-actions]

Warning

Automated review did not complete — this is an infrastructure failure, not a review verdict.

Treat any Claude comment on this PR (including a placeholder like "I'll analyze this and get back to you") as incomplete, not "no findings."

• Run: https://github.com/melodic-software/claude-code-plugins/actions/runs/31573156576
• Failure class: other
• Last SDK result: (no execution file was produced)

Re-run the job to retry the review. A new push re-triggers this lane only if the caller's pull_request triggers include synchronize (the canonical caller omits it).
An automatic retry may already have run — it is skipped when a partial review could duplicate comments, or when the failure class needs an operator (auth).