Add BusCommandRouter

[ccgsnet]

Summary

Adds a bus-command-router service that routes client commands (get, set, query, evolution) to downstream DAS agents while keeping per-client router parameters.

• Router commands: get params, set param <key> <value>, query, and evolution with labeled MeTTa ARGs (q/query, ff, cq, cr, cm).
• Evolution parsing: uses MettaParser to build an atoms tree; cr/cm require the strict 3-level form (((X Y) ...) ...).
• Parameter safety: set only updates existing keys and enforces the current value type.
• Client fixes: router client exits cleanly on errors; get params prints key: value lines.

Examples

# Run the BusCommandRouter service
make run-busnode OPTIONS="--service=bus-command-router --config=config/das.json"

# ---- Client

# Get params
make run-client OPTIONS="--service=bus-command-router --config=config/client.json --cmd=get --arg='params'"

# Set param
make run-client OPTIONS="--service=bus-command-router --config=config/client.json --cmd=set --arg='param max_answers 0'"

# Query
make run-client OPTIONS="--service=bus-command-router --config=config/client.json --cmd=query --arg='(Contains (Sentence \"ede ebe cbe dca cbd fae fce fce add eae\") (Word %W))'"

# Evolution
make run-client OPTIONS="--service=bus-command-router --config=config/client.json --cmd=evolution --arg='((q (Contains %sentence1 (Word \"bbb\"))) (ff count_letter) (cq ((Contains %placeholder1 %word1))) (cr (((placeholder1 sentence1)))) (cm (((sentence1 word1)))))'"

Test plan

make bazel 'test --cache_test_results=no //tests/cpp:bus_command_router_test'
Manual smoke test: get / set / query / evolution via run-client against a running bus node