redact: mask secrets embedded in URL query strings and connection strings

[CyberSunil]

redact.py masks creds in URL userinfo (postgres://user:pw@host) but the same password leaks as a URL query param or connection-string field:

ENV SPRING_DATASOURCE_URL=jdbc:postgresql://db/app?user=sa&password=Sup3rSecret
ENV ConnectionStrings__Default=Server=db;User Id=sa;Password=P@ssw0rd123;

Both return count 0 on main — password goes to the LLM in clear. Common in JDBC/Spring/.NET.

Fix: one pass masking a secret field's value after a compound delimiter (? & ; , or quote). Key stays visible, top-level assignments not double-counted, interpolations left alone.

2 tests fail on main and pass after; 1 regression guard. Full redact suite 13/13.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.06%. Comparing base (a2fe184) to head (b3018fd).
⚠️ Report is 98 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #196      +/-   ##
==========================================
+ Coverage   78.95%   86.06%   +7.10%     
==========================================
  Files          26       53      +27     
  Lines        4158     8145    +3987     
==========================================
+ Hits         3283     7010    +3727     
- Misses        875     1135     +260     

Flag	Coverage Δ
unittests	86.06% <100.00%> (+7.10%)	⬆️

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