feat(o11y): wire fix generator into the self-telemetry spine (PIPE-1066)

[Dylan-M]

Proposed Change

Brings the fix generator into the spine: it now builds per-instance metrics from the
bundle's MeterProvider and shares the bridged logger, matching every other generator.
Traces already covered it at the runtime level (the blitz.generator.run span), so this
adds the two signals it was missing. Threads the constructor through embed dispatch.

How to validate

• Run the fix generator:
  go run ./cmd/blitz --generator-type fix --generator-fix-rate 1s --output-type stdout --metrics-port 9100
• Confirm its self-metrics appear next to the other generators:
  curl -s localhost:9100/metrics | grep blitz_generator_.
• Add --telemetry-logs-otlpendpoint localhost:4317 --telemetry-logs-insecure and confirm
  the fix generator's internal logs bridge to the collector like the others.
• go test ./generator/fix/... ./internal/dispatch/... covers construction and the
  failing-provider path.

Checklist

• Changes are tested
• CI has passed

[Dylan-M]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• fix(o11y): record output request + HEC ACK-poll latency in ms (PIPE-1404) #292
• feat(o11y): lifecycle startup-latency metrics via new runtime weaver registry (PIPE-1066) #291
• feat(o11y): bring stdout/nop outputs fully into the self-telemetry spine (PIPE-1066) #290
• feat(o11y): per-batch output send spans + HEC ACK-poll span (PIPE-1066) #289
• feat(o11y): wire fix generator into the self-telemetry spine (PIPE-1066) #288 👈 (View in Graphite)
• feat(o11y): self-logs via shared entry-point zap->OTel bridge + OTLP log export (PIPE-1066) #287
• feat(o11y): self-tracing via runtime spans, adapter emit spans, and OTLP trace export (PIPE-1066) #286
• feat(o11y): per-instance metrics via injectable MeterProvider, drop package globals (PIPE-1066) #285
• feat(embed): add TelemetrySettings provider bundle + NopTelemetry (PIPE-1066) #284
• main

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