docs: document main entry point

[engels74-bot]

Summary

• Replace the multi-line main entry documentation with a concise one-line Rust doc comment.

Verification

• cargo fmt --all -- --check
• cargo check --all-targets (passes with existing non-Windows unfulfilled lint expectation warnings)

[augmentcode]

🤖 Augment PR Summary

Summary: This PR simplifies the Rustdoc for the binary entry point (main) in src/main.rs.

Changes:

• Replaced the previous multi-line description of startup responsibilities with a concise one-line doc comment

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[augmentcode]

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[engels74-bot]

Advisory merge gate — CI green

REQUEST_CHANGES — Diff only shows main.rs doc comment changes; need to see full PR scope (other files claimed but truncated) to verify correctness, regressions, and conventions.

Advisory only — no formal review, no auto-merge; a human decides.

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_{🤖 gjc fleet · merge-gate}