Add process execution guide

[dprevoznik]

Summary

• New guide at /browsers/process-execution documenting kernel.browsers.process: synchronous exec, background spawn, status, stdin, stdout-stream, PTY resize, and kill, with TypeScript and Python SDK examples plus CLI equivalents. Added to the "Working with your browser > Intermediate" sidebar group, next to File I/O.
• Links out to the new fx co-located agent cookbook as a real-world example of process execution.
• Added a docs stub page and Cookbooks-tab nav entry (cookbooks/fx-colocated-agent) plus a card on the main /cookbooks gallery page for that same cookbook, matching the existing pattern for other cookbook entries.

Test plan

• Validated docs.json is well-formed JSON.
• Checked all referenced CLI flags and SDK method signatures against the kernel CLI (--help) and the kernel-node-sdk/kernel-python-sdk source.
• Did not run mint dev / mint broken-links locally (blocked by sandbox permissions installing the Mintlify CLI); CI's broken-links workflow will cover this.

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Note

Low Risk
Documentation and navigation-only changes with no runtime or security logic modifications.

Overview
Adds a new Process Execution guide at /browsers/process-execution that documents running and managing commands inside a browser VM via kernel.browsers.process: synchronous exec, background spawn, status, SSE stdoutStream, stdin, PTY resize, and kill, with TypeScript/Python examples, CLI snippets, privilege notes (as_root / as_user), and a port-conflict warning for long-running servers.

Wires the page into docs.json under Working with your browser → Intermediate (next to File I/O) and cross-links File I/O, SSH, and the CLI process-control reference.

Also surfaces the fx co-located agent cookbook: a stub nav page (cookbooks/fx-colocated-agent), a Harnesses & Models sidebar entry, and a new card on /cookbooks, linked from the guide’s co-location example section.

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[mintlify]

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Project	Status	Preview	Updated
Kernel	🟢 Ready	View Preview	Sep 9, 2026, 9:10 PM

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[cursor]

Risk assessment: Very Low

Decision: Keep existing approval (risk did not increase)

Re-evaluated after the 20d0213 update. The PR is still documentation-only Mintlify content. Four files, +266 / −0:

• browsers/process-execution.mdx — new user-facing guide for kernel.browsers.process
• cookbooks/fx-colocated-agent.mdx — 4-line external cookbook stub
• cookbooks.mdx — gallery card
• docs.json — two sidebar entries

The new commit only corrects docs examples (spawn no longer binds reserved port 8080; resize now uses a PTY-backed process) and drops “single-tenant” wording. No application logic, infrastructure, auth, CI, or config beyond docs nav. No CODEOWNERS file, so no codeowner review gate applies.

Action: Risk remains Very Low. Prior approval stands; not re-approving.

  

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