Add host bootstrap and repair helpers

Add a dedicated pyro host surface for supported chat hosts so Claude Code, Codex, and OpenCode users can connect or repair the canonical MCP setup without hand-writing raw commands or config edits.

Implement the shared host helper layer and wire it through the CLI with connect, print-config, doctor, and repair, all generated from the same canonical pyro mcp serve command shape and project-source flags. Update the docs, public contract, examples, changelog, and roadmap so the helper flow becomes the primary onramp while raw host-specific commands remain as reference material.

Harden the verification path that this milestone exposed: temp git repos in tests now disable commit signing, socket-based port tests skip cleanly when the sandbox forbids those primitives, and make test still uses multiple cores by default but caps xdist workers to a stable value so make check stays fast and deterministic here.

Validation:
- uv lock
- UV_OFFLINE=1 UV_CACHE_DIR=.uv-cache make check
- UV_OFFLINE=1 UV_CACHE_DIR=.uv-cache make dist-check

CHANGELOG.md

@@ -2,6 +2,18 @@
 
 All notable user-visible changes to `pyro-mcp` are documented here.
 
+## 4.2.0
+
+- Added host bootstrap and repair helpers with `pyro host connect`,
+  `pyro host print-config`, `pyro host doctor`, and `pyro host repair` for the
+  supported Claude Code, Codex, and OpenCode flows.
+- Repositioned the docs and examples so supported hosts now start from the
+  helper flow first, while keeping raw `pyro mcp serve` commands as the
+  underlying MCP entrypoint and advanced fallback.
+- Added deterministic host-helper coverage so the shipped helper commands and
+  OpenCode config snippet stay aligned with the canonical `pyro mcp serve`
+  command shape.
+
 ## 4.1.0
 
 - Added project-aware MCP startup so bare `pyro mcp serve` from a repo root can