Import mcp-to-cli from the rhema workspace

The crate maps MCP tool catalogs to clap commands and back, and has no
rhema dependencies — it was in-tree only because the workspace glob
reached it. Its own repository gives it its own release cadence and
its own crates.io token, scoped to this crate alone.

tests/fixtures/README.md

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+# Fixtures
+
+Trimmed `inputSchema` objects from real MCP servers, plus two
+hand-written stand-ins, so the mapping matrix runs against real shapes.
+All upstream work is MIT-licensed.
+
+## Vendored from github/github-mcp-server
+
+Source: <https://github.com/github/github-mcp-server>, MIT license,
+`main @ 4bcdcdf8d7be`, fetched 2026-11-03. The files carry the
+`inputSchema` object of the named tool, verbatim:
+
+- `create_pull_request.json` — flat scalars, optional booleans, an
+  array of strings.
+- `search_repositories.json` — a boolean with `default: true`
+  (`minimal_output`), string `enum`s (`sort`, `order`), constraint
+  keywords (`minimum`, `maximum`) the mapping ignores.
+- `update_pull_request.json` — the `state: ["open", "closed"]` enum.
+- `create_issue.json` — flat required scalars, with `x-mcp-header`
+  extension keys the mapping ignores.
+- `projects_write_excerpt.json` — hand-trimmed from the 26-property
+  `projects_write` tool: `iterations` (array of objects with per-item
+  `required`) and `updated_field` (a `oneOf` of object variants) kept
+  verbatim, every other property dropped, `required` emptied because
+  both listed names (`method`, `owner`) were among the dropped.
+
+## Hand-written stand-ins
+
+Documented stand-ins for the other two servers named in the spec; the
+shapes are trimmed from their actual tool definitions, not invented.
+
+- `additional_fields.json` — the pydantic shape `sooperset/mcp-atlassian`
+  emits: required scalars, a `pattern` the mapping ignores, and
+  `additional_fields` as a three-variant `anyOf` (`object | string |
+  null`), which is the JSON-flag case, not the nullable case.
+- `get_scene_info.json` — the FastMCP shape `ahujasid/blender-mcp`
+  emits for every optional parameter: `anyOf: [<T>, null]` nullable
+  forms (`user_prompt` with `default: ""`, `query`, `fields` as a
+  nullable array of strings, `limit` integer with `default: 20`) and a
+  required `code` string.