feat: more debug logging when Watch retries

[miparnisari]

Description

Companion to authzed/spicedb#2888

Testing

1. On tab 1, start SpiceDB
2. On tab 2, zed watch --log-level=debug
3. Kill SpiceDB
4. You should see this in zed:

{"level":"debug","error":"rpc error: code = Unavailable desc = closing transport due to: connection error: desc = \"error reading from server: EOF\", received prior goaway: code: NO_ERROR, debug data: \"graceful_stop\"","time":"2026-02-09T12:17:54-03:00","message":"error receiving from Watch stream"}

{"level":"debug","time":"2026-02-09T12:17:54-03:00","message":"will retry from the last known revision GioKHjE3NzA2NTAyNjgxNDg3MTYwOTYuMDAwMDAwMDAwMBIIYWU5MzAzOTk="}

{"level":"error","error":"error retrying the Watch call: rpc error: code = Unavailable desc = connection error: desc = \"error reading server preface: read tcp 127.0.0.1:64100->127.0.0.1:50051: read: connection reset by peer\"","time":"2026-02-09T12:17:54-03:00","message":"terminated with errors"}

[tstirrat15]

:GT<

[codecov-commenter]

Codecov Report

❌ Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 41.72%. Comparing base (fc49cf5) to head (b910015).

Files with missing lines	Patch %	Lines
internal/commands/watch.go	50.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #627   +/-   ##
=======================================
  Coverage   41.71%   41.72%           
=======================================
  Files          38       38           
  Lines        6130     6131    +1     
=======================================
+ Hits         2557     2558    +1     
  Misses       3317     3317           
  Partials      256      256           

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