Function flatten_param_matchers

crates/openshell-policy/src/lib.rs:391–399

Convert MCP params maps into the flat proto/Rego keyspace. Only `name` is currently enforced for tools/call, but this keeps the YAML shape compatible with any future MCP-owned params selectors.

(
    params: BTreeMap<String, ParamMatcherDef>,
)

// currently enforced for tools/call, but this keeps the YAML shape compatible
// with any future MCP-owned params selectors.
fn flatten_param_matchers(
    params: BTreeMap<String, ParamMatcherDef>,
) -> BTreeMap<String, QueryMatcherDef> {
    let mut flattened = BTreeMap::new();
    for (key, matcher) in params {
        flatten_param_matcher(&key, matcher, &mut flattened);
    }
    flattened
}

// Walk one params subtree, carrying the flattened dot-path key accumulated so
// far. Leaf matchers are inserted into the map consumed by the runtime policy.