docs: remove stale Infisical guidance

[altaywtf]

Summary

• remove the stale provider-specific sentence from CLI worktree guidance
• keep the actual setup and verification commands unchanged

Verification

• full pre-push gate passed in CI mode
• 25 test files and 245 tests passed
• coverage gate passed

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Summary by cubic

Removed stale Infisical guidance from the Worktrees section in AGENTS.md to avoid confusion. The setup flow stays the same: run vp install, vp config, then pnpm exec vp run verify.

^{Written for commit ac4f04b. Summary will update on new commits.}

[Copilot]

Pull request overview

Removes stale provider-specific wording from the contributor/agent setup documentation to reduce confusion while keeping the actual worktree setup flow unchanged.

Changes:

• Removed the “No Infisical setup is required.” sentence from the Worktrees section.
• Preserved the existing setup/verification command sequence (vp install, vp config, then pnpm exec vp run verify).

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[cubic-dev-ai]

No issues found across 1 file

_{Re-trigger cubic}

[putio-releaser]

🎉 This PR is included in version 1.2.7 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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