chore: Task 2: run_headless_in — cwd-aware headless launcher

[getappz]

run_headless_in (explicit cwd) added to agent_launch.rs; cargo build clean, 4/4 relevant unit tests pass; clippy check interrupted (stopped, no result) — needs re-run + commit before this item is complete.
Review flagged missing test for run_headless_in's explicit-cwd behavior (TDD requirement in plan Task 2) and unconfirmed clippy run; sending back for fix round to add the cwd test and confirm clippy clean before re-review.
run_headless_in explicit-cwd support complete: cwd test added (unix-gated, unexecutable on this Windows session but pattern-consistent with existing tests), clippy clean via CI's exact flags with a genuine too_many_arguments fix; ready to advance.

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Opened by claude-code on flared:c997d745ae66 for item #529 via agentflare.

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Reviewing files that changed from the base of the PR and between 9eb19fa and 60128aa.

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• src/agent_launch.rs

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