Add crates/plano-cli/ as a full Rust rewrite of the Python CLI.
Binary name: planoai. All subcommands ported: up, down, build,
logs, cli-agent, trace, init. Config validation and Tera template
rendering replace the Python config_generator. CI updated to use
cargo test/build instead of Python test jobs.
* adding canonical tracing support via bright-staff
* improved formatting for tools in the traces
* removing anthropic from the currency exchange demo
* using Envoy to transport traces, not calling OTEL directly
* moving otel collcetor cluster outside tracing if/else
* minor fixes to not write to the OTEL collector if tracing is disabled
* fixed PR comments and added more trace attributes
* more fixes based on PR comments
* more clean up based on PR comments
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Co-authored-by: Salman Paracha <salmanparacha@MacBook-Pro-342.local>
