feat(agent): exclude Code from the "PostHog resources used" bar

[k11kirky]

Problem

The "PostHog resources used" bar above the composer surfaced a Code chip on essentially every task — it was added on any file read. Since a user driving PostHog Code is already, by definition, using Code, the chip carried no information, and its link to the posthog.com/code landing page left people confused about what it was telling them (per the Slack thread that prompted this).

Changes

Removes the code product from the resources-used display entirely:

• Drops the onCodeFileRead PostToolUse hook and its plumbing through claude-agent.ts and session/options.ts.
• Removes the code entry from POSTHOG_PRODUCTS and the corresponding icon / doc-URL entries in SessionResourcesBar.

Other PostHog product chips (Experiments, Feature flags, SQL, …) are unaffected.

How did you test this?

• pnpm --filter agent typecheck and pnpm --filter code typecheck — clean.
• pnpm --filter agent exec vitest run on hooks.test.ts and posthog-products.test.ts (91 tests) — pass.
• pnpm --filter code exec vitest run on accumulateSessionResources.test.ts (3 tests) — pass.
• Biome check on changed files — clean.

Automatic notifications

• Publish to changelog?
• Alert Sales and Marketing teams?

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Created with PostHog Code from a Slack thread

[github-actions]

React Doctor found no issues in the changed files. 🎉

_{Reviewed by React Doctor for commit fa19e75.}

[greptile-apps]

_{Reviews (1): Last reviewed commit: "feat(agent): exclude Code from the "Post..." | Re-trigger Greptile}