refactor(registry): move MCP servers from code to JSON manifests (#1144)

* refactor(registry): move MCP server entries from code to JSON manifests

Move 8 hardcoded MCP server RegistryEntry structs from
builtin_entries() into data-driven JSON files under
registry/mcp-servers/, matching the existing pattern used by
tools and channels. Exclude the GitHub MCP entry which conflicts
with the WASM GitHub tool's OAuth flow.

Extend ManifestKind with McpServer, make version/source optional
on ExtensionManifest (MCP servers don't need them), and add
url/auth fields for MCP-specific config. Update build.rs,
embedded catalog, catalog loader, installer, and CLI display
to handle the new kind and optional fields.

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>

* fix(registry): address PR review — add missing slack-mcp, remove .expect(), fix fmt

- Add missing slack-mcp.json (was dropped during migration)
- Remove production .expect() in get_strict(), replace with .ok_or_else()
- Clean up unwrap_or_default() in key_for() to use .next() directly
- Log warning for MCP manifests missing url field instead of silent empty
- Run cargo fmt to fix formatting diffs

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>

* ci: re-trigger CI with correct base branch (staging)

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>

* fix(ci): improve no-panics check to properly exclude test modules

The grep-based filter only excluded lines literally containing
#[cfg(test)], #[test], or 'mod tests' — not lines *inside* test
modules. Use awk to track hunk context from diff @@ headers and
skip all added lines within test module hunks.

[skip-regression-check]

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>

* refactor(registry): remove slack-mcp MCP entry (conflicts with WASM slack tool)

Remove slack-mcp.json alongside the already-excluded github MCP
entry — both conflict with existing WASM tools of the same name.

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>

* fix(registry): address re-review — skip invalid MCP entries, fix install order

- to_registry_entry() now returns Option<RegistryEntry>; MCP manifests
  missing a url field are skipped with a warning instead of creating
  broken entries with empty URLs
- Move McpServer early-return before require_source() in install paths
  so the error message is clear ("cannot install MCP servers") rather
  than the misleading "missing source spec"
- Add test for MCP manifest with missing URL returning None

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>

---------

Co-authored-by: Claude Opus 4.6 (1M context) <[email protected]>

src/cli/registry.rs

@@ -127,7 +127,11 @@ fn cmd_list(
                 .unwrap_or("none");
             println!(
                 "{:<20} {:<8} {:<8} {:<10} {}",
-                m.name, m.kind, m.version, auth, m.description
+                m.name,
+                m.kind,
+                m.version.as_deref().unwrap_or("-"),
+                auth,
+                m.description
             );
         } else {
             println!("{:<20} {:<8} {}", m.name, m.kind, m.description);
@@ -173,17 +177,25 @@ fn cmd_info(catalog: &RegistryCatalog, name: &str) -> anyhow::Result<()> {
         .map_err(|e| anyhow::anyhow!("{}", e))?;
 
     println!("{} ({})", manifest.display_name, manifest.kind);
-    println!("  Version: {}", manifest.version);
+    if let Some(ref version) = manifest.version {
+        println!("  Version: {}", version);
+    }
     println!("  {}", manifest.description);
 
     if !manifest.keywords.is_empty() {
         println!("  Keywords: {}", manifest.keywords.join(", "));
     }
 
-    println!("\nSource:");
-    println!("  Directory: {}", manifest.source.dir);
-    println!("  Crate: {}", manifest.source.crate_name);
-    println!("  Capabilities: {}", manifest.source.capabilities);
+    if let Some(ref source) = manifest.source {
+        println!("\nSource:");
+        println!("  Directory: {}", source.dir);
+        println!("  Crate: {}", source.crate_name);
+        println!("  Capabilities: {}", source.capabilities);
+    }
+
+    if let Some(ref url) = manifest.url {
+        println!("\nMCP Server URL: {}", url);
+    }
 
     if let Some(artifact) = manifest.artifacts.get("wasm32-wasip2") {
         println!("\nArtifact (wasm32-wasip2):");