Follow up report dff6e149-9cd3-47fb-8e21-b4d3d4bad807: make AST handling exhaustive and preallocate map entries. Verify regex and URL-pattern factories do not expand runtime env/file placeholders while preserving their existing pattern grammar and static behavior.
Code written by GitHub Copilot (GPT-6.1 Sol, Claude Opus 5.5); reviewed by mholt.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
