Fix @context matching.

[dlongley]

No description provided.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 53.98%. Comparing base (4c35ea2) to head (478f886).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #82      +/-   ##
==========================================
+ Coverage   53.75%   53.98%   +0.22%     
==========================================
  Files          21       21              
  Lines        4286     4307      +21     
==========================================
+ Hits         2304     2325      +21     
  Misses       1982     1982              

Files with missing lines	Coverage Δ
lib/query/match.js	95.45% <100.00%> (+0.45%)	⬆️
lib/query/presentationExchange.js	88.76% <100.00%> (ø)
lib/query/util.js	97.39% <100.00%> (+0.33%)	⬆️

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