feat(telemetry): OTel plumbing

[fabriziosestito]

Description

TBD

[codecov]

Codecov Report

❌ Patch coverage is 37.32394% with 89 lines in your changes missing coverage. Please review.
✅ Project coverage is 53.12%. Comparing base (fcf6fe9) to head (dfd994e).
⚠️ Report is 48 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/telemetry/otel.go	13.72%	44 Missing ⚠️
cmd/controller/main.go	0.00%	11 Missing ⚠️
cmd/mcp/main.go	0.00%	11 Missing ⚠️
cmd/worker/main.go	0.00%	10 Missing ⚠️
cmd/storage/main.go	0.00%	9 Missing ⚠️
internal/telemetry/slog.go	80.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1214      +/-   ##
==========================================
- Coverage   53.47%   53.12%   -0.36%     
==========================================
  Files          61       65       +4     
  Lines        5339     5476     +137     
==========================================
+ Hits         2855     2909      +54     
- Misses       2087     2170      +83     
  Partials      397      397              

Flag	Coverage Δ
unit-tests	53.12% <37.32%> (-0.36%)	⬇️

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