Strip hot-path console.log and enforce no-console lint rule

[rupertgermann]

Parent

#1

What to build

Remove debug console.log calls from hot paths (per-frame, per-shot, per-spawn code) and add an ESLint no-console rule (warn level, explicit allowlist for console.warn/console.error) so they cannot silently return.

Acceptance criteria

• No console.log in entity update/fire paths, collision loop, wave spawn loop, or manager constructors
• ESLint flags new console.log usage in src/
• npm run lint passes
• Game boots and plays unchanged

Blocked by

None - can start immediately

[rupertgermann]

Resolved by draft PR #17: #17