feat: guide strengths span the full 0..1 range

mid_scene_guide_strength, the continuity pin/prior/mid-scene strengths, and
the per-guide strength field in the inspector were all clamped to 0.25-0.5 —
the measured audio-safe band, hardcoded as a limit. That band is advice, not
physics: it stays in the tooltips, the clamps go.

Backend clamps in timeline.py, the node input range, the JoyAI memory guide's
0.25 floor, and the three UI spinners all move to 0..1.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

movie_editor/backend/timeline.py

@@ -108,7 +108,7 @@ def _identity_pin_guide(media_ref: str, strength: float, *, is_pin: bool = True)
         "media_ref": media_ref,
         "frame_idx": 0,
         "apply_at": 0,
-        "strength": max(0.25, min(0.5, float(strength))),
+        "strength": max(0.0, min(1.0, float(strength))),
     }
     if is_pin:
         # Marks this entry (not prior-scene/mid-scene/template guides) as the one eligible
@@ -128,14 +128,14 @@ def _prior_scene_guide(prior: Scene, strength: float) -> Optional[dict]:
         "source": "template",
         "frame_idx": 0,
         "apply_at": 0,
-        "strength": max(0.25, min(0.5, float(strength))),
+        "strength": max(0.0, min(1.0, float(strength))),
     }
 
 
 def _decayed_strength(base: float, scene_index: int, decay: float) -> float:
     if scene_index <= 0 or decay >= 0.999:
         return base
-    return max(0.25, min(0.5, base * (decay ** scene_index)))
+    return max(0.0, min(1.0, base * (decay ** scene_index)))
 
 
 def build_auto_continuity_guides(full: Project, target: Project) -> Optional[dict]:
@@ -294,8 +294,9 @@ def anchor_guide_strength(scene: Scene) -> float:
 
 
 def _self_image_guide(media_ref: str, strength: float) -> dict:
-    """A frame-0 guide from the scene's OWN image (anchor_guide mode). Unlike the
-    continuity identity-pin guide, the strength is the user's choice (full 0..1)."""
+    """A frame-0 guide from the scene's OWN image (anchor_guide mode). Same full 0..1
+    range as every other guide strength — the measured audio-safe band is 0.25-0.35,
+    but that is advice, not a clamp."""
     return {
         "enabled": True,
         "source": "image",

movie_editor/frontend/engine_settings.js

@@ -182,7 +182,7 @@
     { name: "decode_timestep",       label: "Decode timestep",       kind: "float", default: 0.05,  min: 0, max: 1,   step: 0.01 },
     { name: "decode_tile_size",      label: "Decode tile size",      kind: "int",   default: 0,     min: 0, max: 4096, step: 64 },
     { name: "mid_scene_guide",       label: "Mid-scene guide",       kind: "bool",  default: false },
-    { name: "mid_scene_guide_strength", label: "Guide strength",   kind: "float", default: 0.25,  min: 0.25, max: 0.5, step: 0.05, dependsOn: "mid_scene_guide" },
+    { name: "mid_scene_guide_strength", label: "Guide strength",   kind: "float", default: 0.25,  min: 0.0, max: 1.0, step: 0.05, dependsOn: "mid_scene_guide" },
     { name: "joyai_memory",          label: "JoyAI-Echo memory",     kind: "bool",  default: false },
     { name: "joyai_memory_size",     label: "Memory size",           kind: "int",   default: 7,     min: 1, max: 32, step: 1, dependsOn: "joyai_memory" },
     { name: "joyai_fix_frames",      label: "Pinned anchors",        kind: "int",   default: 3,     min: 0, max: 16, step: 1, dependsOn: "joyai_memory" },
@@ -636,9 +636,9 @@
       i.oninput = () => patchContinuitySettings({ [key]: parseFloat(i.value || "0") });
       gAdv.append(field(label, i));
     };
-    num("Pin strength", cs.identity_pin_strength, "identity_pin_strength", 0.25, 0.5, 0.05);
-    num("Prior guide strength", cs.prior_scene_strength, "prior_scene_strength", 0.25, 0.5, 0.05);
-    num("Mid-scene strength", cs.mid_scene_guide_strength, "mid_scene_guide_strength", 0.25, 0.5, 0.05);
+    num("Pin strength", cs.identity_pin_strength, "identity_pin_strength", 0.0, 1.0, 0.05);
+    num("Prior guide strength", cs.prior_scene_strength, "prior_scene_strength", 0.0, 1.0, 0.05);
+    num("Mid-scene strength", cs.mid_scene_guide_strength, "mid_scene_guide_strength", 0.0, 1.0, 0.05);
     num("Guide decay / scene", cs.guide_decay, "guide_decay", 0.5, 1, 0.05);
 
     const gMan = group(pane, "Manual");

movie_editor/frontend/inspector.js

@@ -546,7 +546,7 @@
       const ai = el("input"); ai.type = "number"; ai.value = g.apply_at != null ? g.apply_at : 0; ai.title = "apply_at";
       ai.dataset.k = `guide-${idx}-apply`;
       ai.oninput = () => { guides[idx] = { ...g, apply_at: parseInt(ai.value || "0", 10) }; persist(guides, true); };
-      const si = el("input"); si.type = "number"; si.min = "0.25"; si.max = "0.5"; si.step = "0.05";
+      const si = el("input"); si.type = "number"; si.min = "0"; si.max = "1"; si.step = "0.05";
       si.value = g.strength != null ? g.strength : 0.35; si.title = "Strength";
       si.dataset.k = `guide-${idx}-strength`;
       si.oninput = () => { guides[idx] = { ...g, strength: parseFloat(si.value || "0.35") }; persist(guides, true); };

samplers.py

@@ -2270,8 +2270,8 @@ class FunPackLTXAVSceneChainSampler:
                     "tooltip": "Experimental: append the middle frame of the previous scene as a guide for the current scene via LTX guide attention. Helps maintain character positioning across scenes.",
                 }),
                 "mid_scene_guide_strength": ("FLOAT", {
-                    "default": 0.25, "min": 0.25, "max": 0.5, "step": 0.05,
-                    "tooltip": "Guide attention strength for mid-scene anchor. 0.25 is the minimum — below that audio degrades and character appearance drifts. Above 0.35 causes spatial conflicts when scene composition shifts.",
+                    "default": 0.25, "min": 0.0, "max": 1.0, "step": 0.05,
+                    "tooltip": "Guide attention strength for mid-scene anchor. Full 0..1 range. 0.25-0.35 is the measured sweet spot: below 0.25 audio degrades and character appearance drifts, above 0.35 spatial conflicts appear when scene composition shifts. Outside that band is yours to explore — 0 disables the guide's pull entirely.",
                 }),
                 "embed_guidance": ("BOOLEAN", {
                     "default": False,
@@ -4818,7 +4818,7 @@ class FunPackLTXAVSceneChainSampler:
         if not chunk_tensors:
             return chunk, positive, negative, 0
         F_chunk = self._tensor_frames(chunk_tensors[0])
-        s = max(0.25, float(strength))  # same audio-safe floor as mid_scene_guide
+        s = max(0.0, float(strength))  # the user's value stands; 0.25-0.35 is the audio-safe band
         tail = 0
         for i, gf in enumerate(frames):
             apply_at = min(max(0, F_chunk - 1), i)  # prefix context: distinct early positions