docs: add TraitDefinition and ebv_glossary API reference

[zircote]

Summary

Adds missing public API documentation for mcp::analytics module items that were not previously documented in the Library API Reference.

Changes

Added documentation for two public items from crates/mcp/analytics.rs:

TraitDefinition struct

• Documents all five fields with descriptions
• Shows proper Rust type signatures (&'static str)
• Provides example usage context

ebv_glossary() function

• Documents the function signature and return type
• Includes practical code example showing iteration over results
• Cross-references the complete trait table in MCP.md#ebv-trait-glossary

Documentation Quality

• Consistency: Follows existing patterns in LIBRARY-API.md (field tables, code examples, cross-references)
• Completeness: All public API items in mcp::analytics are now documented
• Accuracy: Documentation verified against source code in crates/mcp/analytics.rs:266-281
• Discoverability: Cross-links to related MCP.md documentation

Testing

• All public items from mcp::analytics verified as documented
• Markdown syntax validated
• Cross-reference anchors verified (#ebv-trait-glossary exists in MCP.md)
• Code examples follow existing doc test patterns

Related

Complements recent PR #79 which added comprehensive MCP module documentation.

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Documentation gap identified: These public exports were accessible via use nsip::mcp::analytics::{TraitDefinition, ebv_glossary}; but were undocumented in the reference manual.

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Benchmark Results

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Full results available in CI artifacts.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.83%. Comparing base (47af4a3) to head (3bf2d67).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #82   +/-   ##
=======================================
  Coverage   95.83%   95.83%           
=======================================
  Files           9        9           
  Lines        6499     6499           
=======================================
  Hits         6228     6228           
  Misses        271      271           

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Code Coverage Report

Overall Coverage: 0%

Summary

Filename                      Regions    Missed Regions     Cover   Functions  Missed Functions  Executed       Lines      Missed Lines     Cover    Branches   Missed Branches     Cover
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
client.rs                        1444                67    95.36%         118                13    88.98%         923                35    96.21%           0                 0         -
format.rs                        2172                 3    99.86%         132                 1    99.24%        1292                 1    99.92%           0                 0         -
main.rs                           326               241    26.07%          14                 8    42.86%         225               168    25.33%           0                 0         -
mcp/analytics.rs                  408                 2    99.51%          24                 0   100.00%         331                 0   100.00%           0                 0         -
mcp/mod.rs                        144                55    61.81%          23                15    34.78%         128                65    49.22%           0                 0         -
mcp/prompts.rs                   1908                33    98.27%         126                 6    95.24%        1043                12    98.85%           0                 0         -
mcp/resources.rs                 1317                20    98.48%          93                 1    98.92%         865                 6    99.31%           0                 0         -
mcp/tools.rs                     2146                90    95.81%         116                18    84.48%        1333                47    96.47%           0                 0         -
models.rs                        1079                31    97.13%          78                10    87.18%         762                14    98.16%           0                 0         -
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
TOTAL                           10944               542    95.05%         724                72    90.06%        6902               348    94.96%           0                 0         -

Full HTML report available in CI artifacts.

[Copilot]

Pull request overview

This PR adds complete API reference documentation for the TraitDefinition struct and ebv_glossary() function in the mcp::analytics module, closing a documentation gap for public API items that were previously undocumented.

Changes:

• Documents the TraitDefinition struct with all five fields and their types
• Documents the ebv_glossary() function with signature, description, and usage example
• Adds cross-reference to the complete trait table in MCP.md