Add M2 model card

README.md

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+---
+language: en
+tags: [narrative-context, film-analysis, multi-task, pytorch, transformer]
+---
+# Narrative Context Module 2
+
+Transformer encoder (4L × 8H) over a 5-scene sliding window.
+Consumes scene embeddings from Module 1.
+
+## Input
+5-scene window [t-4 … t] (past + current only).
+Per-scene feature vector: 304-d (M1 embedding + metadata).
+
+## 7 Cross-Scene Heads
+| # | Head | Type | Output |
+|---|------|------|--------|
+| 1 | scene_valence_continuous | regression | -1.0 to 1.0 |
+| 2 | tension_level | regression | 1 to 10 |
+| 3 | arousal_level | regression | 1 to 10 |
+| 4 | emotional_shift_trigger | binary | True / False |
+| 5 | narrative_arc_position | 5-class | Setup, Rising, Climax, Falling, Resolution |
+| 6 | foreshadowing_type | 4-class | None, Foreshadow, Payoff, Echo |
+| 7 | transition_type | 5-class | attacca, fade, segue, silence, cut |