fix(guardrails): address PR #154 review — remove unused import, deduplicate merge regex

[terisuke]

Summary

• Remove unused list import from guardrail-context.ts
• Compute isMerge/isPrMerge booleans once at function entry in bashBeforeGit and reuse throughout, eliminating 12 duplicated regex evaluations
• Same deduplication applied to afterBashGit handler (afterIsMerge, afterIsPrMerge, afterIsPrCreate, afterIsPush)

Addresses inline review comments on PR #154.

Test plan

• No logic change — regex results are cached in variables instead of re-evaluated
• Build passes (guardrails package only)

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[Copilot]

Pull request overview

This PR follows up on review feedback from PR #154 by removing an unused import and reducing repeated command-regex evaluations in the guardrails git handlers, without changing behavior.

Changes:

• Removed an unused list import from guardrail-context.ts.
• Cached isMerge / isPrMerge once in bashBeforeGit() and reused them throughout.
• Applied the same caching approach in bashAfterGit() (afterIsMerge, afterIsPrMerge, afterIsPrCreate, afterIsPush).

Reviewed changes

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

File	Description
packages/guardrails/profile/plugins/guardrail-git.ts	Deduplicates repeated merge/push/PR-create regex tests by caching booleans per invocation.
packages/guardrails/profile/plugins/guardrail-context.ts	Removes an unused import to satisfy lint/typecheck and keep the context module tidy.

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