fix(hookify): make file rules match Write tool content

[ashwingopalsamy]

Summary

Fixes hookify file-rule matching so rules targeting new_text (including legacy event: file + pattern) also match Write tool payloads.

Before this change, Write operations used tool_input.content, but new_text resolution only looked at new_string, so file rules could miss new-file writes.

Changes

• For Write/Edit, content / new_text / new_string now resolve consistently from:
  • new_string (Edit), (or)
  • content (Write).

Test Plan

• Sanity check:
  • File rule with pattern: console\.log\( matches:
    • Write input using tool_input.content
    • Edit input using tool_input.new_string
  • Negative control with non-matching content returns no match.

Risk

Low. Change is limited to Write/Edit field mapping for file-rule evaluation and does not alter unrelated hook events.