fix(agent): preserve task run ID for artifact uploads

[puemos]

Problem

Codex artifact uploads were enabled with a task run ID in the parent process, but the spawned MCP server discarded that ID and rejected every upload as unavailable.

Changes

Preserve taskRunId when decoding and forwarding the local-tool context.

Why: Generated files should be deliverable from Codex cloud tasks through the existing artifact upload tool.

How did you test this?

• Built @posthog/agent
• Ran the focused upload-artifact tests
• Invoked the bundled MCP server directly before and after the fix; the call advanced from the missing-session error to the expected local storage-configuration guard

Automatic notifications

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

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Created with PostHog Code

[trunk-io]

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[github-actions]

React Doctor found no issues in the changed files. 🎉

_{Reviewed by React Doctor for commit 09b54be.}