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Greptile Summary

This PR adds a new documentation page (sigstore-cosign.mdx) for the Infisical KMS + Sigstore Cosign integration, along with the corresponding docs.json navigation entry. The content is accurate and covers the core use cases (install, configure, sign, verify, generate key pair) well.

A few polish items worth addressing before merge:

• Header hierarchy: The ### KMS Plugin Capabilities section uses a third-level heading above ## Setup / ## Usage, which is inverted. Per Mintlify best practices, top-level sections with nested sub-sections should use #, not ##, so the sidebar nesting renders correctly.
• Missing Go prerequisite: The install step runs go build without noting that Go must be installed first, which will confuse users who don't have it.
• Inconsistent placeholder style: The environment variable examples use <angle-bracket> placeholders while the cosign command examples use {curly-brace} placeholders — pick one style throughout for clarity.

Confidence Score: 4/5

• Safe to merge; all issues are non-blocking documentation style improvements.
• The PR is purely documentation — no code changes, no security implications, and no breaking changes. The three flagged items (header hierarchy, missing Go prerequisite, placeholder inconsistency) are all polish-level P2s that don't prevent users from following the guide. The core content is accurate and complete.
• docs/documentation/platform/kms/sigstore-cosign.mdx — minor header hierarchy and style fixes recommended.

Important Files Changed

_{Reviews (1): Last reviewed commit: "docs: sigstore kms docs" | Re-trigger Greptile}