SPEC: note the planned Byline Feed citation integration

[dknauss]

A docs-only change to SPEC §3. It records the planned next step after #143: when Byline Feed is active, Borges would add its cited works to Byline Feed's Article node (<permalink>#article) as citation, using the byline_feed_schema_article filter. Nothing is built yet, because Borges's save output is static and this needs a server-side step. Byline Feed tracks the same item in known-gaps.md (dknauss/author-identity#63).

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https://claude.ai/code/session_019tRjxfxyEhwi8RhyrD8Vvk

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.87%. Comparing base (f9146cb) to head (4818723).

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #144   +/-   ##
=========================================
  Coverage     87.87%   87.87%           
  Complexity       22       22           
=========================================
  Files            59       59           
  Lines          6952     6952           
  Branches        678      678           
=========================================
  Hits           6109     6109           
  Misses          292      292           
  Partials        551      551           

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