docs: tighten download-manager comments

[Kosinkadink]

Follow-up to #1277: trims comments in comfyDownloadManager.ts/.test.ts that were overly verbose or referenced other code paths and prior behavior instead of describing the current one. Comment-only, no behavior change.

• Setup-failure comment: 4 lines -> 3, drops the startModelDownload comparison
• tempFileNameFor doc: drops the "plausible now that" milestone framing
• Byte-identical discard comment: 6 lines -> 4
• Re-download test comment: 6 lines -> 4

Validation: comfyDownloadManager.test.ts 115/115; pre-push hooks (typecheck + lint) passed.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 4b039a5e-b402-4849-9fdc-869b70e87c94

📥 Commits

Reviewing files that changed from the base of the PR and between e76e15f and 34f2535.

📒 Files selected for processing (2)

• src/main/lib/comfyDownloadManager.test.ts
• src/main/lib/comfyDownloadManager.ts

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📝 Walkthrough

Walkthrough

The pull request revises inline comments in the download manager and one related test. No executable logic, assertions, public declarations, or control flow changes.

Changes

Download manager documentation

Layer / File(s)	Summary
Download behavior comment clarifications src/main/lib/comfyDownloadManager.ts, src/main/lib/comfyDownloadManager.test.ts	Comments clarify temporary filename collision avoidance, fire-and-forget failure handling, duplicate output behavior, and repeated-download test behavior.

Suggested reviewers: benceruleanlu

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/tighten-download-comments

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch chore/tighten-download-comments

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