Fix joined-player laser cadence and muzzle position

[sbddesign]

A joining Wasp could sound like it was firing far faster than the host and draw new lasers behind its predicted hull. The same three-second, 100 ms each-way latency probe reproduces this on both pre-lobby 6a73896 and lobby e74a47c: 26 host volleys, 309 local laser sounds, and all 25 newly received local bolts behind the ship (up to 49 units).

Restore the weapon cooldown with snapshots and keep reconciliation silent. Fresh prediction emits one local-pitch sound per volley and cosmetic tracers at the predicted muzzle. Delayed local authoritative bolts remain in the snapshot but are hidden while prediction is active. Cosmetic collisions cannot call ship damage; the host still decides hits and scoring. Session/snapshot protocol is now v3, so both players must reload the same build.

This is a separate fix for a pre-existing bug, stacked on #32 (feat/lobby) because it extends the snapshot protocol. Merge #32 first; its implementation is unchanged.

Validation at 1dac6ae (includes main’s BFG change and the resolved lobby):

• 718 simulation checks, balance contract, typecheck and production build pass.
• Same latency probe: 26 host volleys / 26 sounds; with 25% packet loss: 22 / 22. Every cosmetic tracer starts within 0.001 units of the predicted muzzle.
• Regression checks cover silent replay, cooldown restoration, volley deduplication, no cosmetic damage callbacks, no duplicate authoritative drawing, tracer expiry and new-match reset.
• Full mutation gate rerunning for this merged head (the earlier pre-BFG head passed 136/136).
• Real Chrome/WebRTC host and guest in separate processes with 100 ms each-way delay: 35 host volleys / 34 local WebAudio laser sounds; both remained in flight, zero page errors. Holding F silenced fresh predicted guns during BFG charging. Screenshot and test output retained in the workspace. This was one Mac, not two physical devices.

Preview: https://neon-orbit-git-fix-client-weapons-delineatormedia.vercel.app/?host=2

Typecheck/simulation/balance/build passed locally. Full local and GitHub mutation gates pending on the merged head.

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated
neon-orbit	Ready	Preview	Sep 6, 2026 7:27pm UTC