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/audit/chain.py

@@ -0,0 +1,25 @@
+import pickle,json,collections,re
+A=pickle.load(open("active.pkl","rb"));act=A["active"];tc=A["tagcache"]
+prod=collections.defaultdict(list); cons=collections.defaultdict(set)
+tagsof=collections.defaultdict(set)
+for t,s in tc.items():
+    for i in s: tagsof[i].add(t)
+for rid,(jar,j) in act.items():
+    r=json.dumps(j.get("result",""))+json.dumps(j.get("results",""))+json.dumps(j.get("output",""))
+    for m in set(re.findall(r'"(?:id|item)": "([^"]+)"',r)): prod[m].append(rid)
+    body=json.dumps({k:v for k,v in j.items() if k not in("result","results","output")})
+    for m in re.findall(r'"item": "([^"]+)"|"id": "([^"]+)"',body):
+        cons[m[0] or m[1]].add(rid)
+    for m in re.findall(r'"tag": "([^"]+)"',body): cons["#"+m].add(rid)
+def info(i):
+    c=set(cons[i])
+    for t in tagsof[i]: c|=cons["#"+t]
+    return len(prod[i]),len(c),sorted(prod[i])[:6]
+for i in """extradelight:bread_slice moredelight:bread_slice extradelight:sliced_potato moredelight:diced_potatoes rusticdelight:potato_slices
+dungeonsdelight:fiery_knife twilightdelight:fiery_knife dungeonsdelight:ironwood_knife twilightdelight:ironwood_knife dungeonsdelight:knightmetal_knife twilightdelight:knightmetal_knife dungeonsdelight:steeleaf_knife twilightdelight:steeleaf_knife
+frightsdelight:poisonous_potato_crate dungeonsdelight:poisonous_potato_crate frightsdelight:rotten_tomato_crate dungeonsdelight:rotten_tomato_crate
+handcrafted:wood_plate twilightforest:oak_drying_rack comforts:sleeping_bag_red handcrafted:red_sheet
+adorablehamsterpets:cucumber_crate extradelight:cucumber_crate_item fruitsdelight:apple_crate extradelight:apple_crate
+rusticdelight:coffee_beans_bag extradelight:coffee_bean_sack extradelight:coffee_cherry_crate
+fishermans_haven:worm aquaculture:worm create:copper_nugget twilightforest:copper_nugget twilightdelight:rainbow_ice_cream twilightdelight:refreshing_ice_cream twilightdelight:twilight_ice_cream""".split():
+    print(i, *info(i))