Productionize codebase: cleanup, quality, and dependency audit

- Remove all #[allow(dead_code)] attrs; delete genuinely dead code
- Restructure main.rs to import from library crate instead of re-declaring modules
- Remove ~40 redundant/obvious comments; trim verbose doc comments
- Add #[must_use] to 25+ accessor/query methods
- Replace once_cell::Lazy with std::sync::LazyLock (stable since 1.80)
- Remove 5 unused dependencies (once_cell, futures, futures-util, pin-project-lite, arc-swap)
- Fix atomic ordering: ReadinessState SeqCst → Release/Acquire
- Inline format args, simplify redundant closures
- Downgrade noisy per-request info! logs to debug!
- Remove Cargo.lock from .gitignore (should be committed for binary crates)
- Delete .DS_Store files and README.draft.md

Author: HueCodes

.gitignore

@@ -1,5 +1,4 @@
 /target/
-Cargo.lock
 
 # Editor and IDE
 *.swp