fix(registry-client): accept 2025-12-11 wrapped MCP Registry schema#6
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`registry.modelcontextprotocol.io` switched its list and detail
responses to a new envelope:
{ "server": <core>, "_meta": { ... } }
The flat shape (`core` fields at the top level) is still emitted by
older deployments. Today `pakx search` against the real upstream
returns zero MCP results because every entry hits the existing
`#[derive(Deserialize)]` on the flat-only `ServerRaw` and fails.
Surfaced while writing the TS port of this client for
`pakx-web` `/explore` (pakxdev/pakx-web#3) — both layers needed
the same fix.
- Split `ServerRaw` into:
- `ServerCore` — the flat field set (unchanged semantics).
- `ServerRaw` — `#[serde(untagged)]` enum over `Wrapped { server,
_meta }` and `Flat(ServerCore)`. Decoders try `Wrapped` first;
legacy flat payloads fall through.
- `into_package` now folds `_meta` (when present) into the
`install_hints` object so the resolver can read upstream status
flags without re-parsing.
- Two new wiremock tests cover the wrapped shape on both `search`
and `fetch`; existing flat-shape tests still pass unchanged.
CI clippy rejected `ServerRaw::Wrapped` / `ServerRaw::Flat` inside the impl block. Use `Self::*` instead.
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Summary
registry.modelcontextprotocol.ioswitched its list and detail responses to a new envelope:```json
{ "server": , "_meta": { ... } }
```
The flat shape (core fields at the top level) is still emitted by older deployments. Today `pakx search` against the real upstream returns zero MCP results because every entry hits the existing flat-only `ServerRaw` and fails decode.
Surfaced while writing the TS port of this client for `pakx-web` `/explore` (pakxdev/pakx-web#3) — both layers needed the same fix.
Changes
Test plan