Add SystemParameters

[ccgsnet]

Summary

Centralizes DAS runtime defaults in config/das.json via SystemParameters and SystemParametersSingleton. Agent proxies load merged params from agents.<name>.params (with base_query layered where applicable) instead of hardcoded values or a separate client.json.

• SystemParameters — parses agents.*.params into Properties; agent getters (get_query_agent_params, etc.)
• SystemParametersValidation — versioned schema (1.0, aligned with schema_version in das.json); required keys, unknown keys, and type checks
• bus_node / bus_client — both use das.json; bus_client defaults to config/das.json and drops client.json
• Tests — system_parameters_test, shared fixture in test_commons/TestSystemParams.h

Config shape

agents.base_query.params holds shared query defaults; each service adds/overrides its own agents.<agent>.params.

Examples

busnode

Start the query engine (endpoint/ports from agents.query when using --config):

make run-busnode OPTIONS="--config=config/das.json --service=query-engine"

Start evolution agent:

make run-busnode OPTIONS="--config=config/das.json --service=evolution-agent"

busclient

Pattern-matching query against query-engine:

make run-client OPTIONS="--client=query-engine --query=LINK_TEMPLATE Expression 3 NODE Symbol Similarity VARIABLE V1 VARIABLE V2"

Test

• make bazel test //tests/cpp:system_parameters_test
• Start query-engine + run query busclient example above
• Confirm invalid/unknown keys in agents.*.params fail at startup with a clear validation error