Phase 5: soft gates instead of guardian flags, shoulder passives

Adrian (2026-10-31): HMs abilities stay open; the ones that get around
zone hazards get soft gates (materials or a high-level Pokemon, never
flags; gifted Pokemon and materials count the same); party passives from
shoulder Pokemon; Cobblebase skills and the Power Block move to soft
gates too.

- Gates: a zone gate passes at the top of the zone's band or while the
  Pokemon holds the zone's material (or a harder zone's). Cobblebase
  skills check the pastured Pokemon and tell the owner once what it needs.
- Progress record, guardian unlock messages, the Power Block placement
  gate and /cobblesurvival progress removed; the Power Block's recipe
  already needs Jungle redstone.
- HmsGate: switches off gated HMs auras (Flash, Dive, Mist, Rock Climb,
  Magnet Rise, Lucky Chant, Lava Plume) whose Pokemon doesn't pass.
- ShoulderPassives: type-based effects from shoulder Pokemon, hazard
  ones (warmth, frigidness, water breathing, night vision) gated.
- Self-tests for all of it; docs, balance table, Phase 5 checklist.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

mod/src/main/kotlin/dev/cobblesurvival/CobbleSurvival.kt

@@ -8,8 +8,8 @@ import dev.cobblesurvival.dev.BiomePreview
 import dev.cobblesurvival.dev.OreVeins
 import dev.cobblesurvival.ore.OreNodes
 import dev.cobblesurvival.permadeath.Permadeath
+import dev.cobblesurvival.party.ShoulderPassives
 import dev.cobblesurvival.progress.Gates
-import dev.cobblesurvival.progress.Progress
 import dev.cobblesurvival.selftest.SelfTest
 import dev.cobblesurvival.world.OnlyPokemon
 import dev.cobblesurvival.world.SharedLoot
@@ -68,6 +68,7 @@ class CobbleSurvival {
         NeoForge.EVENT_BUS.addListener(Zones::onAddReloadListeners)
         Guardians.register()
         Gates.register()
+        ShoulderPassives.register()
         OreNodes.register()
         Catching.register()
         Wanderers.register()
@@ -106,7 +107,6 @@ class CobbleSurvival {
             })
             .then(BiomePreview.command())
             .then(OreVeins.command())
-            .then(Progress.command())
             .then(Commands.literal("zone").executes { context ->
                 val source = context.source
                 val zone = Zones.at(source.level, BlockPos.containing(source.position))