[Access] Document MCP portal Code Mode policies

[kennyj42]

Summary

• document the four MCP portal Code Mode policies and their client overrides
• replace the deprecated allow_code_mode examples with code_mode
• add an Access changelog entry

Testing

• git diff --check origin/production...HEAD
• full build parsed the changed MDX and rendered the new changelog page, then exceeded the 10-minute local timeout during RSS generation
• pnpm run check is blocked by existing generated skill templates that cannot resolve ExportedHandler and Fetcher

Rollout

Keep this PR in draft until MCP-205 runtime support is ready to ship.

[cloudflare-docs-bot]

Review

⚠️ 1 warning found in commit 5938034.

👉 Fix in your agent 👈

Fix the following review findings in PR #32432 (https://github.com/cloudflare/cloudflare-docs/pull/32432).

Before making changes, review each finding and present a brief summary table:
- For each finding, state whether you agree, disagree, or need clarification
- If you disagree (e.g. the fix requires disproportionate effort for minimal benefit,
  or the finding is factually incorrect), explain why
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After triaging, follow this order:
1. Post a comment on this PR for any findings you are skipping, with the finding ID and your reasoning.
2. Then commit the fixes for the legitimate findings.

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---

## Style Guide Review

### Warnings (1)

#### SG-194d63cc7bb0 · Enable/disable for toggles
- **File:** `src/content/docs/cloudflare-one/access-controls/ai-controls/mcp-portals.mdx` line 474
- **Issue:** Line 474 uses `enabled` to describe toggle state (`whether they are currently enabled in the session`).
- **Fix:** Use `turned on` instead of `enabled` for toggle state, consistent with the rest of the page.

Code Review

This code review is in beta and may not always be helpful — use your judgment.

_{No code review issues found.}

Conventions

_{No convention issues found.}

Style Guide Review

Warnings (1)

File	Issue
cloudflare-one/access-controls/ai-controls/mcp-portals.mdx line 474	Enable/disable for toggles — Line 474 uses enabled to describe toggle state (whether they are currently enabled in the session). Fix: Use turned on instead of enabled for toggle state, consistent with the rest of the page.

Commands

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/rebase	Rebases the PR branch against production. On conflict, attempts to resolve automatically using AI. Stops with an explanation if confidence is not high enough.

[kennyj42]

/rebase

[scaraclette]

LGTM!