DRY violations - duplicated configuration across Rust/Python/Shell

[SystemicVoid]

Summary

The codebase has significant DRY (Don't Repeat Yourself) violations where configuration values are duplicated across Rust, Python, and Shell code. This creates maintenance burden and risk of inconsistency.

Critical Violations

#	Knowledge	Locations
1	Port 8765 (daemon)	parakeet-ptt/src/config.rs:12, parakeet-stt-daemon/config.py:16, scripts/stt-helper.sh:71
2	Port 8080 (LLM)	parakeet-ptt/src/main.rs:66, scripts/stt-helper.sh:87
3	Path /tmp/parakeet-*	scripts/stt-helper.sh:15-22, parakeet-ptt/main.rs:3141, overlay_process.rs:1050
4	Header x-parakeet-secret	parakeet-ptt/config.rs:373, parakeet-stt-daemon/server.py:131
5	Binary name parakeet-overlay	main.rs:1313, overlay_renderer.rs:34,119

Recommended Fix

Make scripts/stt-helper.sh the single source of truth for operator-facing config. Have Rust/Python derive values from environment variables at runtime rather than hardcoding.

Note

This needs critical review before implementation - some duplications may be intentional (e.g., defense in depth). Please review each violation before refactoring.