chore(bmad): migrate 80_bmad/base from 6.0.4 to 6.9 + port customizations to TOML overrides

Migration des modules via l'installer officiel (Quick update, en place) :
- core/bmm 6.0.4 -> 6.9.0
- tea 1.5.3 -> 1.19.0
- cis 0.1.8 -> 0.2.1

Portage des customisations Lead_tech vers le nouveau mécanisme d'overrides
(_bmad/custom/<skill>.toml, couche "team" résolue par resolve_customization.py) :
- 6 agents directs (analyst, architect, dev, pm, tech-writer, ux-designer)
- module tea
- workflows: dev-story, create-story, code-review, quick-dev, qa-generate-e2e-tests
- agents disparus en 6.9 reportés vers leurs workflows hôtes
  (QA -> code-review, SM -> create-story, quick-flow-solo-dev -> quick-dev)
- règle de capitalisation 95_a_capitaliser factorisée dans
  _bmad/custom/leadtech-capitalisation.md (référencée via persistent_facts)

Nettoyage du legacy 6.0.4 :
- suppression des 17 *.customize.yaml (non lus par 6.9)
- suppression des .bak générés par l'installer (contenu porté en .toml)
- suppression de 17 skills orphelins dans .agents/skills (anciens noms, .agents/.claude réalignés 66=66)
- suppression des coquilles de workflows disparus

Tous les overrides validés par le resolver officiel (12/12 JSON valide,
base préservée + ajouts Lead_tech). Le cœur (couche customize.toml) n'est plus modifié,
donc les updates 6.x futurs ne pourront plus écraser ces customisations.

Note env: resolve_customization.py exige Python >=3.11 (uv installé, python3 -> 3.12.13).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

80_bmad/base/.agents/skills/bmad-index-docs/SKILL.md

@@ -1,10 +1,66 @@
 ---
 name: bmad-index-docs
-description: Execute index-docs
+description: 'Generates or updates an index.md to reference all docs in the folder. Use if user requests to create or update an index of all files in a specific folder'
 ---
 
-# index-docs
+# Index Docs
 
-Read the entire task file at: {project-root}/_bmad/core/tasks/index-docs.xml
+**Goal:** Generate or update an index.md to reference all docs in a target folder.
 
-Follow all instructions in the task file exactly as written.
+
+## EXECUTION
+
+### Step 1: Scan Directory
+
+- List all files and subdirectories in the target location
+
+### Step 2: Group Content
+
+- Organize files by type, purpose, or subdirectory
+
+### Step 3: Generate Descriptions
+
+- Read each file to understand its actual purpose and create brief (3-10 word) descriptions based on the content, not just the filename
+
+### Step 4: Create/Update Index
+
+- Write or update index.md with organized file listings
+
+
+## OUTPUT FORMAT
+
+```markdown
+# Directory Index
+
+## Files
+
+- **[filename.ext](./filename.ext)** - Brief description
+- **[another-file.ext](./another-file.ext)** - Brief description
+
+## Subdirectories
+
+### subfolder/
+
+- **[file1.ext](./subfolder/file1.ext)** - Brief description
+- **[file2.ext](./subfolder/file2.ext)** - Brief description
+
+### another-folder/
+
+- **[file3.ext](./another-folder/file3.ext)** - Brief description
+```
+
+
+## HALT CONDITIONS
+
+- HALT if target directory does not exist or is inaccessible
+- HALT if user does not have write permissions to create index.md
+
+
+## VALIDATION
+
+- Use relative paths starting with ./
+- Group similar files together
+- Read file contents to generate accurate descriptions - don't guess from filenames
+- Keep descriptions concise but informative (3-10 words)
+- Sort alphabetically within groups
+- Skip hidden files (starting with .) unless specified