agents.max_threads=6 but Codex Desktop runtime is capped at 4

Codex Desktop ignores the configured multi-agent concurrency limit.

Expected:
agents.max_threads = 6, matching the documented default and my explicit configuration.

Actual:
The runtime allocates only 4 concurrency slots, including the root agent.

I fully restarted Codex and created a new task. The problem persists.

Environment:

• Thread ID: 019f6053-ea47-73e0-8633-9bfd4e981ea4
• Codex CLI: 0.144.2
• Desktop build: 150.0.7871.115
• macOS: 15.5.0
• Multi-agent runtime: v2
• Config: ~/.codex/config.toml
• Config value: agents.max_threads = 6

Diagnostics performed:

• No project-level override
• No system-level override
• No MDM override found
• No startup --config override
• Restarting and creating a new task did not resolve it

Please explain why this account/runtime is capped at 4 while the documented default is 6, and restore the expected concurrency.