feat(config): register diffusion_models as a first-class path key

ComfyUI keeps UNet-only Flux checkpoints under models/diffusion_models/
(paired with separate clip/ and vae/ files), distinct from the unified
models/checkpoints/. tsr previously had no way to track that directory
in its config — `tsr config --set-path diffusion_models=...` errored
because the CLI validator's allow-list only knew the 7 CivitAI-aligned
types (checkpoints, loras, embeddings, vae, controlnet, upscalers,
other). Workaround was a manual symlink from diffusion_models/ back
into checkpoints/, which is fragile (mixed link styles, breaks if the
target file is reorganised) and confuses `tsr models`/`tsr db list`
(same file shows up under two loader headings).

Changes:

- config.py: new VALID_PATH_TYPES constant as the single source of
  truth for keys accepted by `tsr config --set-path KEY=PATH`. Adds
  "diffusion_models" to the list and a synthetic "DiffusionModel"
  bucket in DEFAULT_PATHS pointing at MODELS_DIR/diffusion_models.
  Comment notes that CivitAI does not have a DiffusionModel
  model_type (UNet-only Flux files are returned as "Checkpoint"), so
  auto-routing from `tsr dl` will never pick this bucket — it exists
  for explicit `tsr dl -o /path/to/diffusion_models` workflows and for
  `tsr config --show` visibility into where the dir lives on disk.

- cli.py: imports VALID_PATH_TYPES and replaces the two duplicated
  inline lists (set-path validator + custom-marker display in the
  `config` command). No behaviour change for the existing 7 types.

After this lands and is `uv tool upgrade tensors`'d, users can
`tsr config --set-path diffusion_models=/path/to/comfyui/models/diffusion_models`
and `tsr dl -v <civitai-version-id> -o /path/to/diffusion_models` for
UNet-only Flux downloads, no more symlink workarounds.

tensors/cli.py

@@ -29,6 +29,7 @@ from tensors.config import (
     COMFYUI_DEFAULT_WIDTH,
     CONFIG_FILE,
     MODEL_FAMILY_DEFAULTS,
+    VALID_PATH_TYPES,
     BaseModel,
     CommercialUse,
     ModelType,
@@ -673,10 +674,9 @@ def config(
 
         path_type, path_value = set_path.split("=", 1)
         path_type = path_type.lower().strip()
-        valid_types = ["checkpoints", "loras", "embeddings", "vae", "controlnet", "upscalers", "other"]
 
-        if path_type not in valid_types:
+        if path_type not in VALID_PATH_TYPES:
-            console.print(f"[red]Error: Invalid type '{path_type}'. Valid: {', '.join(valid_types)}[/red]")
+            console.print(f"[red]Error: Invalid type '{path_type}'. Valid: {', '.join(VALID_PATH_TYPES)}[/red]")
             raise typer.Exit(1)
 
         cfg = load_config()
@@ -713,10 +713,7 @@ def config(
         configured_paths = cfg.get("paths", {})
 
         for path_str, types in sorted(shown_paths.items(), key=lambda x: x[0]):
-            is_custom = any(
+            is_custom = any(path_str == configured_paths.get(k) for k in VALID_PATH_TYPES)
-                path_str == configured_paths.get(k)
-                for k in ["checkpoints", "loras", "embeddings", "vae", "controlnet", "upscalers", "other"]
-            )
             marker = " [green](custom)[/green]" if is_custom else " [dim](default)[/dim]"
             console.print(f"  {', '.join(sorted(types))}: {path_str}{marker}")
 

tensors/config.py

@@ -26,6 +26,11 @@ GALLERY_DIR = DATA_DIR / "gallery"
 LEGACY_RC_FILE = Path.home() / ".sftrc"
 
 # Default download paths by model type (can be overridden in config.toml [paths])
+#
+# Note: "DiffusionModel" is not an official CivitAI model_type — CivitAI lumps
+# UNet-only files (e.g. Flux UNet released separately from CLIP+VAE) under
+# "Checkpoint". The DiffusionModel entry here exists so users can register a
+# ComfyUI `diffusion_models/` path and target it manually via `tsr dl -o`.
 DEFAULT_PATHS: dict[str, Path] = {
     "Checkpoint": MODELS_DIR / "checkpoints",
     "LORA": MODELS_DIR / "loras",
@@ -34,9 +39,23 @@ DEFAULT_PATHS: dict[str, Path] = {
     "VAE": MODELS_DIR / "vae",
     "Controlnet": MODELS_DIR / "controlnet",
     "Upscaler": MODELS_DIR / "upscalers",
+    "DiffusionModel": MODELS_DIR / "diffusion_models",
     "Other": MODELS_DIR / "other",
 }
 
+# Config-file keys accepted by `tsr config --set-path KEY=PATH`. Single source
+# of truth shared between the CLI validator and the display-marker logic.
+VALID_PATH_TYPES: list[str] = [
+    "checkpoints",
+    "loras",
+    "embeddings",
+    "vae",
+    "controlnet",
+    "upscalers",
+    "diffusion_models",
+    "other",
+]
+
 CIVITAI_API_BASE = "https://civitai.com/api/v1"
 CIVITAI_DOWNLOAD_BASE = "https://civitai.com/api/download/models"
 
@@ -297,7 +316,8 @@ def get_model_paths() -> dict[str, Path]:
     config = load_config()
     paths_config = config.get("paths", {})
 
-    # Map config keys to CivitAI model types
+    # Map config keys to CivitAI model types. "diffusion_models" maps to the
+    # synthetic "DiffusionModel" bucket (see DEFAULT_PATHS for rationale).
     key_to_types = {
         "checkpoints": ["Checkpoint"],
         "loras": ["LORA", "LoCon"],
@@ -305,6 +325,7 @@ def get_model_paths() -> dict[str, Path]:
         "vae": ["VAE"],
         "controlnet": ["Controlnet"],
         "upscalers": ["Upscaler"],
+        "diffusion_models": ["DiffusionModel"],
         "other": ["Other"],
     }
 
@@ -745,6 +766,7 @@ FLUX_UNET_ONLY_PATTERNS: tuple[str, ...] = (
     "getphatflux",  # getphatFLUXReality_v11Softcore.safetensors
     "moodydesire",  # moodyDesireMix_v20PRO.safetensors
     "fcfluxpony",  # fcFluxPonyPerfectBase_fcFluxPerfectBase.safetensors
+    "prototype_",  # prototype_v10.safetensors (Flux unet-only, no "flux" in name)
 )
 
 
@@ -753,6 +775,26 @@ def _is_flux_unet_only(name_lower: str) -> bool:
     return any(p in name_lower for p in FLUX_UNET_ONLY_PATTERNS)
 
 
+# All-in-one Flux checkpoint filename substrings (case-insensitive). These
+# checkpoints bundle UNet + CLIP-L + T5 + VAE in a single file (loadable via
+# CheckpointLoaderSimple), but their filename does NOT contain "flux" so the
+# generic substring check misses them and they fall through to SDXL defaults
+# (which fails when the SDXL VAE isn't installed on the target backend).
+#
+# Detect via header inspection: keys like `model.diffusion_model.double_blocks.*`
+# plus bundled `text_encoders.*` and `vae.*` prefixes indicate FLUX all-in-one.
+# Add new patterns here as we encounter them.
+FLUX_ALL_IN_ONE_PATTERNS: tuple[str, ...] = (
+    "ultrasense",  # ultrasenseInfinity_v10.safetensors
+    "bodyslider",  # bodySliderFitness_v10.safetensors
+)
+
+
+def _is_flux_all_in_one(name_lower: str) -> bool:
+    """True if the lowercased filename matches a known all-in-one Flux pattern."""
+    return any(p in name_lower for p in FLUX_ALL_IN_ONE_PATTERNS)
+
+
 # Flux.2 Klein 9B filename substrings (case-insensitive). These checkpoints are
 # UNet-only AND require the Flux.2 architecture (Qwen3-8B encoder, Flux2
 # scheduler). Detection is primarily via base_model field ("Flux.2 Klein"); the
@@ -804,6 +846,14 @@ def detect_model_family(model_name: str, base_model: str | None = None) -> str |
     if _is_flux_unet_only(name_lower):
         return "flux_unet"
 
+    # All-in-one Flux override for checkpoints whose filename omits "flux"
+    # (e.g. "ultrasenseInfinity_v10.safetensors"). Without this they fall
+    # through to the SDXL default at the bottom of this function and the
+    # generated workflow asks ComfyUI for sdxl_vae.safetensors — which fails
+    # on Flux-only backends like sin.
+    if _is_flux_all_in_one(name_lower):
+        return "flux"
+
     # Architecture override: filename containing "flux" wins over any base_model
     # field (handles hybrid models like "FluxPony" that CivitAI tags as "Pony"
     # but are architecturally Flux and need the Flux workflow).