fix(store): dash capability IDs + .chain bundles (chain catalog conformance)

chain's catalog charset (naming.rs check_segment, capability-namespaces.yaml)
allows only [a-z0-9-] per dot-segment — underscores are rejected by
`chain validate`. Repack all 8 modules with the dash capability form
(econ.skm-score, law.benefit-score, …) and align the store index, flows,
app strings and docs to match. Bundles now use the .chain extension
(content-addressed; legacy .fai would still install).

- store/store.yaml: name: dash, wasm_url .chain, refreshed sha256
- store/SHA256.txt: 8 new .chain hashes
- flows + app/lib + RUN.md + MACHBARKEITSSTUDIE.md: capability refs _ -> -
- left untouched: text_akoma_normalize.wasm artifact, DB field skm_score,
  backlog module law.skm_score

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

flows/test-cohort.yaml

@@ -1,4 +1,4 @@
-# Minimal-Test: nur stats.cohort_size, ohne externe Calls.
+# Minimal-Test: nur stats.cohort-size, ohne externe Calls.
 # Beweist, dass meine Module mit dem Hub-ABI kompatibel sind.
 
 name: test-cohort
@@ -8,7 +8,7 @@ inputs:
 
 steps:
   - id: cohort
-    use: stats.cohort_size@^0
+    use: stats.cohort-size@^0
     with:
       cohort_id: $inputs.cohort_id