Fixes#2437 for French.
- agents.md: update PM triggers CP/VP/EP → PRD, remove stale US trigger
from Technical Writer, align PRD description to create/update/validate
- commands.md: fix Cursor/Windsurf skill paths to .agents/skills/,
update core tools count to 12, align PRD description
- core-tools.md: add missing bmad-customize tool entry and section with
link to customize-bmad how-to
- party-mode.md: replace stale "BMad Master orchestre" with "Le Party
Mode orchestre la discussion"