feat: initial text-readability-score v0.1.0 (text.readability_score@0.1.0)

Composite readability/complexity score: Flesch-DE + Verweistiefe
+ verb-distance. Reuse-lens: any project that needs to flag
"this text is hard to read" — government letters, AGB, scientific
abstracts.

Flesch-DE follows the Amstad adaptation:

  FRE_de = 180 − ASL − (58.5 × ASW)

ASL = avg sentence length (words); ASW = avg syllables per word.
A FRE_de around 30 reads as "schwer"; below 10 is technical-jargon
territory.

Verweistiefe uses an optional graph input (output of
graph.citation_extract). i.V.m.-edges count double because they
force the reader to chase a second norm.

composite_frust scales both to 0..10 and averages, so the output
is a single number the heatmap can plot against the §6 Studie
"Frust"-Achse.

Pure in-WASM, zero filesystem, zero network.

Reserved for next versions:

  - 0.2: noun-density and Schachtelsatz penalty
  - 0.3: per-paragraph breakdown so the UI can highlight the
         most-frustrating Absatz

Signed-off-by: flemming-it <sf@flemming.it>

module.yaml

@@ -0,0 +1,39 @@
+schema_version: 3
+provider: chain
+name: text-readability-score
+version: 0.1.0
+
+# Composite readability score for any text — Flesch (DE-adapted)
+# + Verweistiefe + verb-distance.
+#
+# Reuse-lens: any project that wants to flag "this text is hard
+# to read" — government letters, AGB, scientific abstracts.
+provides:
+  - capability: text.readability_score
+    version: 0.1.0
+
+inputs:
+  norm:
+    type: json
+    description:
+      en: NormalizedNorm (output of text.akoma_normalize).
+      de: NormalizedNorm (Output von text.akoma_normalize).
+  graph:
+    type: json
+    optional: true
+    description:
+      en: Optional citation graph from graph.citation_extract — used to compute Verweistiefe.
+      de: Optionaler Zitationsgraph aus graph.citation_extract — für Verweistiefe.
+
+outputs:
+  score:
+    type: json
+    description:
+      en: |
+        { flesch_de: 0..100, depth_index: 0..10,
+          composite_frust: 0..10 }.
+      de: |
+        { flesch_de: 0..100, depth_index: 0..10,
+          composite_frust: 0..10 }.
+
+permissions: []