fix: improve diffctx edge discovery, expand stopwords, fix test data

Author: nikolay-e

.gitleaks.toml

@@ -6,4 +6,9 @@ paths = [
     '''\.secrets\.baseline''',
     '''tests/cases/diff/kubernetes/k8s_406_secret_reference\.yaml''',
     '''tests/cases/diff/kubernetes/k8s_418_image_pull_secret\.yaml''',
+    '''tests/cases/diff/algorithm/algorithm_004_fragment_markdown_section_diffctx\.yaml''',
+    '''tests/cases/diff/docker/docker_039_compose_secrets_before\.yaml''',
+    '''tests/cases/diff/docker/docker_039_compose_secrets_after\.yaml''',
+    '''tests/cases/diff/fragments/fragments_018_config_yaml_top_level_keys_before\.yaml''',
+    '''tests/cases/diff/fragments/fragments_018_config_yaml_top_level_keys_after\.yaml''',
 ]

.pre-commit-config.yaml

@@ -165,7 +165,7 @@ repos:
     rev: v2.4.1
     hooks:
       - id: codespell
-        args: ["--write-changes", "--ignore-words-list=crate,nd,ser,llm,async,cli,theses,datas,hel"]
+        args: ["--write-changes", "--ignore-words-list=crate,nd,ser,llm,async,cli,theses,datas,hel,afterall,aftereach"]
         exclude: ^(\.git/|\.venv/|venv/)
 
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