chore: drop dead code, sync stale comments

- delete api/categorize.py: orphaned module, never imported. The live
  pzmm-types→category mapping is _types_to_category in mlos_sort.py.
- delete api/adapters.py:_autopick_ambiguous: 5-line wrapper around
  _apply_branch_rules with zero callers in current source.
- delete docs/backlog/polling-path-pz-build.md: described work that
  shipped — init/06_sort_jobs_pz_build.sql plus pz_build plumbing in
  jobs.create_job, app._route_to_job, and app._build_result_for_job.
- sync MAP_LINE convention comment in api/mlos_sort.py with the worker
  copy (Muldraugh, KY is appended at the end, not prepended at the
  front — see adapters.build_response:577).
- update init/04_required_wsids.sql header to reflect the authed-API
  fetch path (HTML scrape was retired in 3a34b71).
- soften the now-stale '~14 rows' count in app._strip_path_prefix's
  docstring.

api/adapters.py

@@ -552,13 +552,6 @@ def _apply_branch_rules(
 
 # Backwards-compat shim used by existing call sites that don't yet pass
 # pz_build/input_modids. Removed once all callers migrate.
-def _autopick_ambiguous(mods: List[ModInfo]) -> Tuple[Set[str], List[Dict[str, Any]]]:
-    drop_ids, warns, _hints = _apply_branch_rules(
-        mods, pz_build="B42", input_modids={m.id for m in mods},
-    )
-    return (drop_ids, warns)
-
-
 def build_response(
     input_ids: List[str],
     hit_ids: List[str],

api/app.py

@@ -131,10 +131,10 @@ class ResortRequest(BaseModel):
 def _strip_path_prefix(deps) -> List[str]:
     """Defensively normalize dep names. Strips leading backslashes (B42 path
     syntax: `\\StarlitLibrary` -> `StarlitLibrary`) and trims whitespace.
-    Worker._split_csv applies this at parse time, but ~14 mod_parsed rows
-    in the live DB were written before that fix landed and will only refresh
-    when their wsid's time_updated advances on Steam. Normalizing here keeps
-    missing-dep matching correct against legacy rows."""
+    Worker._split_csv applies this at parse time, but a handful of legacy
+    mod_parsed rows were written before that fix landed and will only
+    refresh when their wsid's time_updated advances on Steam. Normalizing
+    here keeps missing-dep matching correct against legacy rows."""
     out: List[str] = []
     for d in (deps or []):
         s = (d or "").strip().lstrip("\\")

api/categorize.py

@@ -1,58 +0,0 @@
-"""Public helper for mapping pzmm content-type tags to sortof CATEGORY_ORDER.
-
-The same mapping is also inlined in `mlos_sort.py` (both api/ and worker/
-copies, deliberately — worker uses a separate venv with no FastAPI deps,
-so it cannot import from api/). This module exposes the helper for
-non-mlos consumers (e.g. /api/conflicts diagnostics output) without
-forcing them to drag in the whole sorter module.
-
-Source: pzmm core/mods.py:detect_mod_types ordering, mapped to sortof's
-CATEGORY_ORDER buckets per docs/plans/2026-05-04-pzmm-conflict-and-typing.md
-§3.4.
-"""
-
-from __future__ import annotations
-
-from typing import Dict, List, Optional
-
-# Items / Animations / Lua / Unknown intentionally absent — too generic to
-# drive a category decision; callers should fall through to other heuristics.
-_TYPE_TO_CAT: Dict[str, str] = {
-    "Maps":         "map",
-    "Vehicles":     "vehicle",
-    "Weapons":      "weapon",
-    "Clothing":     "wearable",
-    "Traits":       "code",
-    "Professions":  "profession",
-    "Recipes":      "crafting",
-    "Tiles":        "tile",
-    "Textures":     "texture",
-    "Sounds":       "sound",
-    "UI":           "ui",
-    "Translations": "translation",
-    "Patch":        "patch",
-    "Dependency":   "tweaks",
-    "Framework":    "tweaks",
-}
-
-
-def types_to_category(mod_types: List[str], name: str = "") -> Optional[str]:
-    """First mod_type that maps to a sortof CATEGORY_ORDER bucket wins.
-
-    Returns the bucket name (e.g. "weapon", "vehicle"), or None when:
-      - mod_types is empty (manifest not yet built), or
-      - mod_types contains only skip-types (Items / Animations / Lua / Unknown).
-
-    The `name` arg is used for the vehicle_spawn refinement only — when a
-    Vehicles-tagged mod is named like "spawn zone X", the more specific
-    `vehicle_spawn` bucket wins over the generic `vehicle`.
-    """
-    if not mod_types:
-        return None
-    for t in mod_types:
-        cat = _TYPE_TO_CAT.get(t)
-        if cat:
-            if cat == "vehicle" and name and "spawn zone" in name.lower():
-                return "vehicle_spawn"
-            return cat
-    return None

api/mlos_sort.py

@@ -722,11 +722,11 @@ def sort_mods(
         if wid and wid not in workshop_set:
             workshop_seen.append(wid)
             workshop_set.add(wid)
-    # MAP_LINE convention: dependencies first (leftmost), dependents last
-    # (rightmost). Vanilla Muldraugh, KY is the ultimate base and is
-    # prepended at the very front by adapters.build_response. `order` is
-    # already topo-sorted by mod-level deps so dependencies appear before
-    # their dependents — walk it forward.
+    # MAP_LINE convention: dependencies first (leftmost), dependents next.
+    # Vanilla Muldraugh, KY is ALWAYS appended at the very end by
+    # adapters.build_response. `order` is already topo-sorted by mod-level
+    # deps (require= / loadAfter= / loadBefore=), so dependencies appear
+    # before their dependents — walk it forward.
     map_folders: List[str] = []
     for mod_id in order:
         for mf in by_id[mod_id].maps: