chore: promptshield + tsconfig updates

[mayank1513]

Automated changes:

• add .promptshield to .gitignore
• add rootDir to tsconfig
• replace prettier with promptshield in vscode recommendations

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.90%. Comparing base (2f31494) to head (52ef282).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #33   +/-   ##
=======================================
  Coverage   98.90%   98.90%           
=======================================
  Files           1        1           
  Lines          91       91           
  Branches       21       21           
=======================================
  Hits           90       90           
  Misses          1        1           

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