feat: gate StdioTransport behind default-on stdio feature#30
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Move StdioTransport, serve_stdio, and the rig_mcp_stdio_fixture binary behind a new `stdio` Cargo feature that is enabled by default. The feature is what pulls `tokio` and the matching rmcp transports (`transport-io`, `transport-child-process`); the base rmcp surface stays at `client` + `server` + `macros`. This restores the runtime-agnostic guarantee documented in AGENTS.md: the `McpTransport`, `LoopbackTransport`, `McpTool`, `CachedResultsTransport`, `RegistrationSnapshot`, and `result_cache` surfaces all compile under `--no-default-features` without tokio in the direct dependency tree. Default-features users see no behavior change. CI now exercises both `--all-features` and `--no-default-features` to keep the runtime-agnostic surface honest. Justfile clippy recipe runs both feature combos locally as well. Also fixes duplicate `### Added` headers in the v0.2.0 and v0.2.2 CHANGELOG entries that release-plz had emitted from sibling commits, and refreshes README + AGENTS.md to describe the feature and surfaces honestly.
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Move
StdioTransport,serve_stdio, and therig_mcp_stdio_fixturebinary behind a newstdioCargo feature, enabled by default. The feature pullstokioand the matching rmcp transports (transport-io,transport-child-process); the base rmcp surface stays atclient+server+macros.This restores the runtime-agnostic guarantee documented in AGENTS.md: the
McpTransport,LoopbackTransport,McpTool,CachedResultsTransport,RegistrationSnapshot, andresult_cachesurfaces all compile under--no-default-featureswithout tokio in the direct dependency tree. Default-features users see no behavior change.CI now exercises both
--all-featuresand--no-default-featuresto keep the runtime-agnostic surface honest. Justfileclippyrecipe runs both feature combos locally as well.Also fixes duplicate
### Addedheaders in the v0.2.0 and v0.2.2 CHANGELOG entries and refreshes README + AGENTS.md to describe the feature and surfaces honestly.