fix(introspector): use MCP handshake info for name, version, and capabilities

[bug-ops]

Summary

Fixes three bugs in Introspector::discover_server() where values were read from local config instead of the MCP handshake InitializeResult:

• introspector: server name uses command path instead of MCP handshake name #84 — ServerInfo.name used config.command (e.g. docker) instead of server_info.name from the handshake
• introspector: server version hardcoded as "unknown" despite MCP handshake providing it #79 — ServerInfo.version was hardcoded "unknown" instead of server_info.version from the handshake
• introspector: supports_resources incorrectly true when server advertises resources: None #80 — supports_resources used list_all_resources().await.is_ok() which returned true even when the server advertised resources: null; now uses capabilities.resources.is_some()

Also fixes supports_prompts which was always false regardless of the server's advertised capabilities.

All four values are now read from client.peer_info() with a safe fallback to (config.command, "unknown", false, false) when peer info is unavailable.

Implementation

The peer-info extraction logic was factored into a private extract_peer_meta helper to make it independently unit-testable without spawning a real MCP server process.

Test plan

• 10 new unit tests added covering all four fields in both Some and None peer-info paths
• 636 tests pass (cargo nextest run --all-features --workspace)
• 9 doc tests pass
• cargo +nightly fmt --check clean
• cargo +stable clippy --all-targets --all-features --workspace -- -D warnings clean

[codecov-commenter]

Codecov Report

❌ Patch coverage is 95.23810% with 5 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
crates/mcp-introspector/src/lib.rs	95.23%	5 Missing ⚠️

@@            Coverage Diff             @@
##           master      #88      +/-   ##
==========================================
+ Coverage   88.84%   88.98%   +0.13%     
==========================================
  Files          33       33              
  Lines        7605     7706     +101     
==========================================
+ Hits         6757     6857     +100     
- Misses        848      849       +1     

Flag	Coverage Δ
mcp-cli	88.98% <95.23%> (+0.13%)	⬆️
mcp-codegen	88.98% <95.23%> (+0.13%)	⬆️
mcp-core	88.98% <95.23%> (+0.13%)	⬆️
mcp-files	88.98% <95.23%> (+0.13%)	⬆️
mcp-introspector	88.98% <95.23%> (+0.13%)	⬆️
mcp-server	88.98% <95.23%> (+0.13%)	⬆️
mcp-skill	88.98% <95.23%> (+0.13%)	⬆️

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Files with missing lines	Coverage Δ
crates/mcp-introspector/src/lib.rs	87.53% <95.23%> (+5.26%)	⬆️

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