sampler: uncap JoyAI-Echo memory strength (0.5 -> 10.0)

The 0.5 ceiling was only on the widget bounds (samplers.py INPUT_TYPES +
the editor's Chain Sampler knob); the apply path (_append_joyai_memory_guides)
only enforces the 0.25 audio-safe FLOOR, no upper clamp, so higher values
already flow through. Raise max to 10.0 in both widgets so identity can be
pushed past the audio-safe band. Floor (0.25) kept — below it audio degrades
and identity drifts. Tooltip notes 0.25-0.5 is the audio-safe band; higher
pushes identity harder but may degrade audio / over-constrain motion.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

movie_editor/frontend/engine_settings.js

@@ -261,7 +261,7 @@
     { 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" },
     { name: "joyai_frame_select",    label: "Frame select",          kind: "combo", choices: ["center", "first", "random"], default: "center", dependsOn: "joyai_memory" },
-    { name: "joyai_memory_strength", label: "Memory strength",       kind: "float", default: 0.3,   min: 0.25, max: 0.5, step: 0.05, dependsOn: "joyai_memory" },
+    { name: "joyai_memory_strength", label: "Memory strength",       kind: "float", default: 0.3,   min: 0.25, max: 10.0, step: 0.05, dependsOn: "joyai_memory" },
     { name: "joyai_audio_memory",    label: "Paired audio memory",   kind: "bool",  default: false, dependsOn: "joyai_memory" },
     { name: "v2a_grad_scale",        label: "Video→audio coupling", kind: "float", default: 1.0, min: 0.0, max: 4.0, step: 0.25, dependsOn: "joyai_audio_memory" },
     { name: "alg_blur_guides",       label: "Blur i2v guides and JoyAI memory", kind: "bool", default: false },

samplers.py

@@ -2212,8 +2212,8 @@ class FunPackLTXAVSceneChainSampler:
                     "tooltip": "Which frame of each finished scene to store in the bank (JoyAI default 'center').",
                 }),
                 "joyai_memory_strength": ("FLOAT", {
-                    "default": 0.3, "min": 0.25, "max": 0.5, "step": 0.05,
-                    "tooltip": "Guide-attention strength for each memory frame. Same 0.25 floor as mid_scene_guide (below it audio degrades and identity drifts).",
+                    "default": 0.3, "min": 0.25, "max": 10.0, "step": 0.05,
+                    "tooltip": "Guide-attention strength for each memory frame. 0.25 floor as mid_scene_guide (below it audio degrades and identity drifts). Uncapped at the top: 0.25-0.5 is the audio-safe band, higher values push identity harder but may degrade audio/over-constrain motion.",
                 }),
                 # NOTE: append-only — keep new sampler widgets at the END of this block so the
                 # builder's positional reference-workflow mapping (extract_widgets) stays aligned.