Null Kinetics: a full movement suite (dash, air jumps, wall run, glide, slide, grapple) + CI hardening

[Qynl]

💨 Null Kinetics — the movement layer

A complete parkour-style movement kit themed on the realm's residual null energy, plus a craftable grapple weapon, energy/Flow systems, HUD, commands, config, and advancements. ~3,650 new lines across 49 files.

Abilities

Ability	Input	Description
Void Dash	V	Look-direction dash with FOV punch, portal burst + electric trail; aim up to dash skyward
Null Step	Space (airborne)	Up to two mid-air jumps; wall jumps refund a charge
Sculk Stride	automatic	Wall run along walls while airborne; Space wall-jumps off with momentum retention
Null Drift	hold C	Energy-glide: capped fall speed + forward steering
Phase Slide	tap Sneak while sprinting	Anti-friction ground slide (~11 blocks) with momentum-keeping slide hop
Nullhook	right-click item	Craftable grapple (chain/string/echo shard): flying hook entity, anchor, pull, retract — with rope + wireframe renderer

Systems

• Energy pool (100, regenerating) with per-ability costs and a fall-damage grace window
• Flow: chaining abilities stacks speed + cost reduction (max 6), shown as HUD pips
• Server-authoritative with zero-latency feel: the client predicts every move through the same KineticMath the server validates with; continuous effects run as server-revalidated windows (energy drain, fall forgiveness, invalidation on landing)
• HUD: segmented energy bar, ability icons with cooldown sweeps + active glows + live keybind badges, flow pips with pulse (J toggles)
• Custom payloads (Fabric networking API) for dash/jump-intent/window intents and a compact state sync
• /kinetics command: info, reload, toggle <ability>, energy <n>
• JSON config (config/myfirstmod-kinetics.json), auto-generated, clamped, hot-reloadable; optional requireRelic mode
• 7 advancements (Airwalker, Wall Dancer, Flow State challenges…), Nullhook recipe, generated 16×16 HUD icons (tools/gen_kinetics_icons.py, dependency-free rasterizer)

Bug fixes found along the way

• Server crash on boot: dimension_type/null_realm.json used the pre-1.21 nested int provider, was missing has_ceiling, and infiniburn wasn't a tag id → dedicated servers failed to load registries
• Loot table never loaded: loot_tables/ → loot_table/ (1.21 datapack folder rename)
• Mixin config was never applied: fabric.mod.json had no "mixins" entry (and the config referenced a nonexistent TitleScreenMixin)

CI

• Compile errors are surfaced as annotations + step summary
• Dedicated-server smoke test: the fresh JAR boots on a real Fabric 1.21.1 server with Fabric API; must reach Done with zero mod-related datapack/mixin errors; the /kinetics command tree and the Nullhook entity are exercised live over RCON (tools/rcon.py); config generation is verified
• Boss rewards added to creative tabs (Nullblade → combat, Heart of the Null → ingredients, Nullhook → tools)

All checks green on the branch ✅