feat: ship a gallery pack with a working scene of each feature

[adamico]

Summary

The Gallery pack, Pipeworks Gallery: a datapack in the jar, off by default, with a working scene of each README feature (libworks ADR 0010).

 src/main/resources/
+├── gallery_pack/data/pipeworks/function/gallery/
+│   ├── build.mcfunction      # nine scenes, rows of three, each row 16 north of the last
+│   ├── clear / sign / pool   # shared: clear a plot, a sign that replays its scene, a glass-walled source
+│   └── pipes, buckets, one_fluid, breaking, tank_level, creative_pipe, pump, outlet, dismantle
 └── assets/pipeworks/lang/en_us.json   # + sign text, pack name
 src/main/java/.../
 ├── Pipeworks.java            # + GalleryPack.register
 └── gametest/
+    └── GalleryTests.java     # GalleryCheck, a row at a time
 build.gradle                  # libworks-runtime 0.1.8 → 0.1.9

Scenes use water and lava, since Pipeworks registers no fluid. Every source is walled in glass, and the clear fills structure_void before air, so no fluid survives a rebuild. Rows of three, not one row: this follows 5thlayer/factoryworks#691's dev-client findings, so pumps stay within simulation distance. GalleryCheck.builds lays one row only, so the test calls its parts per row (5thlayer/libworks#31 to fold rows in).

The README also says tanks that touch share their contents. Rendering them as one is #27.

Evidence

• Before: no gallery pack; /function pipeworks:gallery/build is unknown.
  After: runGameTestServer passes in full, including:
  • gallery_builds_a_scene_of_each_feature: the pack is offered and off, the build runs with no failing command, and each scene's key block stands.
  • gallery_outlet_scene_sets_its_water_down: the Pump fills the run, and the Outlet sets a water source in its basin.
  • gallery_scenes_sign_clicked_builds_the_scene_again: clicking a sign rebuilds the scene and leaves nothing loose.
• The scenes were looked at in the dev client.

Merge Danger

Door: two-way

Blast Radius: small

The pack is off unless a player turns it on, and it adds no recipes, loot or worldgen. The nested libworks-runtime moves to 0.1.9, which every Module nesting it gets through FML's newest-in-range pick.

Closes #26

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