docs(models): clarify free BYOK and ChatGPT access

[cooper-gadd]

what

• document Anthropic/OpenAI BYOK and Amp/Cursor keys on the Free plan
• document paid ChatGPT subscription access for Codex, OpenCode, and Pi on every Tembo plan
• clarify that AWS Bedrock and GCP Vertex AI BYOK still require a paid Tembo plan

why

Align the public model, model settings, and pricing documentation with tembo/monorepo#9977.

verification

• git diff --check
• confirmed the branch has no conflicts with the latest origin/main

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---

Note

Low Risk
Documentation-only edits to features/models.mdx with no runtime or security impact.

Overview
Models documentation now matches current plan entitlements instead of framing everything around Max and generic BYOK.

The intro explains that Free gets select open-source models via Tembo Managed Inference, paid plans unlock the full managed catalog, and workspaces can use BYOK or a ChatGPT subscription for their own model access. The BYOK section splits provider availability: OpenAI, Anthropic, Cursor, and Amp on every plan including Free; AWS Bedrock and GCP Vertex AI only on paid plans. It also documents ChatGPT subscription on all plans (including Free) for supported OpenAI models with Codex, OpenCode, or Pi, while keeping the note that inference via BYOK/subscription is $0 and VM compute still uses the usage allowance.

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