docs: point to Infisical Agent Proxy from readme and docs

[saifsmailbox98]

Summary

Agent Vault's readme and docs never mentioned Infisical Agent Proxy, so anyone evaluating the two had no way to tell them apart from here (#353).

Adds an "Agent Vault and Infisical Agent Proxy" section to the readme that describes both options and recommends Agent Proxy for most use cases, and rewrites the shared enterprise-cta.mdx snippet to point at Agent Proxy instead of managed Agent Vault.

• Readme section frames Agent Vault as the self-contained open-source option and Agent Proxy as the native one built into Infisical, closing on the recommendation
• enterprise-cta.mdx now leads with Agent Proxy and keeps the existing Book a demo with us link; it already renders on 7 pages, so the pointer picks up that distribution for free
• installation.mdx imports the snippet too (previously had no CTA), putting it in front of readers at the point they decide to install
• Both Agent Proxy links go to https://infisical.com/blog/agent-proxy rather than the docs overview

Copy deliberately avoids calling Agent Proxy "managed" (it ships in the Infisical CLI or as a container and you deploy it yourself) and avoids "successor" framing, keeping the readme softer than the launch post.

Type of change

• Bug fix
• New feature
• Refactor / cleanup
• Documentation
• CI / build

Test plan

Docs and readme only, no Go or web changes.

• Existing tests pass (make test)
• Added/updated tests for new behavior
• Manual testing (describe below)

Rendered the docs locally with mint dev and checked the snippet on /, /installation, and the other pages that import it.

Note: self-hosting/postgres.mdx renders <EnterpriseCTA /> three times (pre-existing), so the Agent Proxy pointer now repeats three times on that page. Left as-is; happy to trim it to one.

Security checklist

• No secrets or credentials in code
• No new unauthenticated endpoints
• Input validation on new API surfaces
• Checked for OWASP top 10 (injection, XSS, etc.)

[infisical-review-police]

💬 Discussion in Slack: #pr-review-agent-vault-355-docs-point-to-infisical-agent-proxy-from-readme-and-do

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Project	Status	Preview	Updated (UTC)
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[greptile-apps]

Greptile Summary

Adds documentation that distinguishes Agent Vault from Infisical Agent Proxy and recommends Agent Proxy for most use cases.

• Adds the comparison and recommendation to the README.
• Rewrites the shared enterprise CTA to promote Agent Proxy.
• Adds the shared CTA to the installation guide.

Confidence Score: 5/5

The documentation-only changes appear safe to merge.

The new MDX import follows established repository conventions, the shared snippet remains valid, and no concrete broken link, rendering failure, misleading product claim, or SSRF path was established.

Important Files Changed

Filename	Overview
README.md	Adds a clear product comparison and recommendation without introducing a concrete documentation defect.
docs/installation.mdx	Imports and renders the existing CTA snippet using the same valid MDX pattern as other documentation pages.
docs/snippets/enterprise-cta.mdx	Replaces the managed Agent Vault message with structurally valid Agent Proxy guidance and preserves the demo link.

_{Reviews (1): Last reviewed commit: "docs: point to Infisical Agent Proxy fro..." | Re-trigger Greptile}