6c8bf0a522
- subagent-sdk: the default registry name becomes `dsh-sdk` (the bare `sdk` read ambiguously in configs); READMEs, config catalog, fixture, and suites follow. The Loader fixture now omits providerName to exercise the shipped default end to end. - loader-composition.e2e: two full harness runtimes boot in sequence, so the default 30s loader-smoke window times out under host load; raise the subprocess deadline to 120s with matching vitest headroom (the real-model.e2e precedent).