RFC: controller2

[hdonnay]

Some experimenting with making the controller more direct with less internal concurrency.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.29%. Comparing base (f44032c) to head (064122e).
⚠️ Report is 592 commits behind head on main.

Files with missing lines	Patch %	Lines
libindex/fetcher.go	0.00%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1263      +/-   ##
==========================================
- Coverage   56.34%   56.29%   -0.06%     
==========================================
  Files         233      233              
  Lines       15351    15363      +12     
==========================================
- Hits         8650     8648       -2     
- Misses       5815     5828      +13     
- Partials      886      887       +1     

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