docs: client-perf analysis, bench harness and work journal

Everything the next agent needs to run the Phase 2 optimisation loop on a
machine that can launch the client:

- analysis/client-perf/: LEVERS (ranked levers + corrections), BENCH-MATRIX
  (world, scenes, config IDs, blocks B0-B14 with decision rules),
  PLAYER-TUNING, SPAWN-TUNING, research briefs, the jar scanner and its
  output, observed default configs, and proposed-configs/ (build.py
  generates tiers and bench variants and fails on unknown keys;
  apply_variant.py applies a variant and merges options.txt).
- analysis/client-perf/bench/onion-bench/: bench-world datapack (scene
  teleports, Create grid, mob pen, sound storm, 120 s teleport tour).
- analysis/audit/: the static recipe/dependency audit, including gen_fixes.py,
  which generates the shipped Paxi datapack and was never tracked.
- phase0/: per-machine measurement harness (Steam Deck, 7700K/1060,
  6700K/1080 Ti).
- .pi/journal.md: running work log; read it first.

All of it is packwizignored, so nothing here ships to players.

analysis/client-perf/data/observed-default-configs/simulated-client.toml

@@ -0,0 +1,36 @@
+#.
+#Settings of Simulated Items
+[items]
+	#.
+	#.
+	#When to display physics properties in block tooltips
+	#Allowed Values: ALWAYS, SHIFT, GOGGLES, SHIFT_GOGGLES, NEVER
+	displayProperties = "GOGGLES"
+	#.
+	#The sensitivity of scrolling when holding a sub-level with the Creative Physics Staff
+	# Default: 0.6000000238418579
+	# Range: 0.0 ~ 3.4028234663852886E38
+	physics_staff_scroll_sensitivity = 0.6000000238418579
+	#.
+	#The sensitivity of rotation when holding a sub-level with the Creative Physics Staff
+	# Default: 0.3499999940395355
+	# Range: 0.0 ~ 3.4028234663852886E38
+	physics_staff_rotate_sensitivity = 0.3499999940395355
+	#.
+	#If ponders that have new additions should display the "(New!)" text
+	show_new_ponders = true
+
+#.
+#Settings of Simulated Blocks
+[block]
+	#.
+	#.
+	#Offsets the Steering Wheel GUI on the X axis.
+	# Default: 0
+	# Range: -1000 ~ 1000
+	steering_wheel_x_offset = 0
+	#.
+	#Offsets the Steering Wheel GUI on the Y axis.
+	# Default: 0
+	# Range: -1000 ~ 1000
+	steering_wheel_y_offset = 0