feat(i18n): add multilingual wiki scaffolding, language switcher, and… (#212)

* feat(i18n): add multilingual wiki scaffolding, language switcher, and translation QA pipeline

* docs(readme): adopt picoclaw-style multilingual link bar

* fix(i18n): repair localized index links and tighten partial-pair QA

* ci(i18n): fail on broken markdown links in README/wiki

* ci(i18n): add changed-files mode for markdown link checks

* i18n(de): use local Argos MT to fill untranslated German sections

* i18n(es,fr): fill untranslated sections via local Argos workflow

* i18n(ja): fill untranslated sections with scoped local Argos pass

* i18n(ko): fill untranslated sections with scoped local Argos pass

* fix(i18n): address review feedback

---------

Co-authored-by: David Abutbul <David.a@prompt.security>

.github/workflows/i18n-qa.yml

@@ -0,0 +1,35 @@
+name: i18n QA
+
+on:
+  pull_request:
+    branches: [main]
+    paths:
+      - 'README*.md'
+      - 'wiki/**/*.md'
+      - 'scripts/i18n/**'
+      - '.github/workflows/i18n-qa.yml'
+  workflow_dispatch:
+
+permissions: read-all
+
+jobs:
+  i18n-qa:
+    name: Translation Integrity Checks
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          fetch-depth: 0
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
+        with:
+          python-version: '3.12'
+      - name: Run i18n QA
+        run: python scripts/i18n/qa_check.py
+
+      - name: Check markdown links (README/wiki)
+        run: |
+          if [ "${{ github.event_name }}" = "pull_request" ]; then
+            python scripts/i18n/link_check.py --changed-only --base-ref "origin/${{ github.base_ref }}"
+          else
+            python scripts/i18n/link_check.py
+          fi