Fixes a hang by separating error channels.

[jeff-cohere]

The DTS has been getting a lot of transfer status requests, and this surfaced a few issues that were related to errors crossing in channels. Separating all the error pathways fixed the issues.

[github-actions]

PR Preview Action v1.8.1
🚀 View preview at https://kbase.github.io/dts/pr-preview/pr-229/
Built to branch gh-pages at 2026-07-23 21:39 UTC. Preview will be ready when the GitHub Pages deployment is complete.

[codecov]

Codecov Report

❌ Patch coverage is 56.41026% with 85 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.14%. Comparing base (95b5c78) to head (0033e0a).

Files with missing lines	Patch %	Lines
transfers/store.go	54.92%	25 Missing and 7 partials ⚠️
transfers/mover.go	55.26%	17 Missing ⚠️
transfers/dispatcher.go	61.53%	8 Missing and 2 partials ⚠️
transfers/manifestor.go	61.53%	10 Missing ⚠️
transfers/stager.go	66.66%	8 Missing ⚠️
transfers/transfers.go	25.00%	4 Missing and 2 partials ⚠️
transfers/errors.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #229      +/-   ##
==========================================
- Coverage   59.24%   59.14%   -0.10%     
==========================================
  Files          34       34              
  Lines        4615     4656      +41     
==========================================
+ Hits         2734     2754      +20     
- Misses       1564     1578      +14     
- Partials      317      324       +7     

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[mattldawson]

looks good!