Better docs

[xsedla1o]

Summary

• Add a telemetry troubleshooting guide covering metrics, hook execution, rejected datapoints, and cached-attribute BSON sizes.
• Add generated dp3 sh command reference documentation and improve shell command help/completion.
• Extend telemetry collection and shell output for event logging, worker hooks, and snapshot/task/updater execution; reject duplicate hook registrations.
• Enable configured event-log buffering and update example configuration and API documentation.
• Speed up Docker image builds by using uv, reducing build contexts, and improving dependency-layer caching.
• Add focused tests for telemetry, hook instrumentation, shell documentation, and worker lifecycle behavior.