Lava Boats

Fixed

• Lava boats sank on dedicated servers. The two mixins that create lava buoyancy -- AbstractBoatLavaMixin (the float boost and resurface bob) and the per-loader fluid hook (BoatWaterFabricMixin / BoatFluidForgeMixin / BoatFluidNeoForgeMixin) -- were registered under the "client" key of their mixin configs, so Mixin skipped them entirely in a SERVER environment. On a dedicated server AbstractBoat.getStatus() never saw lava as water, the status resolved to IN_AIR, and floatBoat() applied full gravity with no float boost. Because tick() gates floatBoat() on isLocalInstanceAuthoritative() -- true on the server whenever nobody is riding -- an unridden boat fell to the bottom of the lava, and a ridden one sank as soon as authority returned to the server (dismount, relog, chunk reload). Both mixins now register under "mixins" and run in either environment.
• Single-player was never affected, which is why this went unnoticed: an integrated server runs inside the client JVM, where the client-only configs apply normally.
• Every jar from 1.4.0 through 1.4.9 was affected, on all three loaders and every MC version from 1.20.1 to 26.3. The mixins were common before the 1.4.0 single-source unification; that commit filed them under "client" and silently undid the earlier multiplayer-sink fix.

Changed

• Both fluid hooks now declare require = 3 on their three-method @Redirect. Mixin's default of require = 1 accepts a single successful injection out of the three target methods, so a partial application could pass silently; all three are now mandatory.
• Full 44-jar matrix rebuilt (Fabric 10 / Forge 15 / NeoForge 19), -Xlint:all clean, zero javac warnings.
• D23 -- the loader now reports the real mod version. Forge and early-NeoForge cells declare version = "${file.jarVersion}" in mods.toml, which FML fills from the jar manifest's Implementation-Version; that attribute was never written, so 18 cells reported 0.0NONE to the loader and Forge/NeoForge 1.20.6 reported a stale hardcoded 1.2.0. Every Forge and NeoForge cell now stamps Implementation-Title / Implementation-Version / Implementation-Vendor, with the -forge / -neoforge filename suffix stripped from the value. Caught by the pre-publish metadata gate, which lava-boats had never been run through before.

Testing

• New float gate (Server_Tests/lavaboat-float-gate/ on the harness) -- a server-side BEHAVIOUR gate in the shape of the storm and catch-up gates. It builds a stone basin, fills it with three layers of lava, summons an UNRIDDEN boat above it, and asserts the boat's Y at 6s and 12s. A boot smoketest cannot see this bug: the mod loads clean and logs nothing.
• Proven in both directions before being trusted. Pre-fix jars report Y=101.0 (resting on the basin floor, three lava layers down) on both the 1.20 Boat line and the 1.21.2+ AbstractBoat line; fixed jars report Y=103.72, stable across both samples.
• CRITICAL tier green on all three loaders: Fabric 1.20.1 / 1.21.1 / 1.21.11 / 26.1.2 / 26.2 / 26.3-snapshot-7, NeoForge 1.20.1 / 1.21.1 / 1.21.11 / 26.1.2, Forge 1.20.1 / 1.21.1 / 1.21.11.