docs(agent-feedback): file text body and non-null assertion gaps

[DylanPiercey]

Files the parser gaps left after 5.18.0. Text-only bodies are lexed as JavaScript, so prose and CSS bodies need a mode that recognizes only placeholders and the closing tag (<title>It's</title> fails today), and <script> bodies need regex literals lexed so /["']/g does not open a string. A TypeScript ! after whitespace or after } is still read as a prefix operator.

Also updates the escaped-quote item with the <script> regex cases it covers (/\"/g runs to the end of the file, and /^https?:\/\// silently comments out the rest of its line), and a fix direction that keeps \</style> closing its tag.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.89%. Comparing base (05d5789) to head (a85cd0a).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #259   +/-   ##
=======================================
  Coverage   99.89%   99.89%           
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  Files          35       35           
  Lines        4711     4711           
  Branches      912      912           
=======================================
  Hits         4706     4706           
  Misses          4        4           
  Partials        1        1           

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