chore(ai-config): align Claude, Copilot and Codex setup

[PierreBrisorgueil]

Summary

• CLAUDE.md — ajout preflight / guardrails / definition of done, commandes canoniques, stack merge workflow et tableau des skills
• ERRORS.md — error log structuré avec règles et format d'entrées datées
• AGENTS.md — guide Codex-specific (prompt routing, review convention) ; architecture et guardrails déféré à CLAUDE.md
• .github/copilot-instructions.md — contrat ERRORS.md + section Available prompts référençant .github/prompts/
• .github/prompts/*.prompt.md — 5 prompts réécrits comme playbooks autonomes pointant vers .claude/skills/*/SKILL.md
• .github/pull_request_template.md — template PR standard avec scope, validation et guardrails checklist
• .vscode/extensions.json + settings.json — recommandations extensions Copilot et opt-in instruction files
• README.md — section :robot: étendue de Claude-only vers AI Setup table (Claude, Copilot, Codex)

Aligned with: pierreb-devkit/Vue#3545

Scope

• Modules impacted: none (config/tooling only)
• Cross-module impact: none
• Risk level: low

Validation

• npm run lint
• npm test
• No behavior change — documentation and tooling config only

Guardrails check

• No secrets or credentials introduced
• No risky rename/move of core stack paths
• Changes remain merge-friendly for downstream projects
• No behavior change — documentation and tooling config only

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.07%. Comparing base (bffa019) to head (3f2d4a3).
⚠️ Report is 7 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3128   +/-   ##
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  Coverage   88.07%   88.07%           
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  Files          51       51           
  Lines        1115     1115           
  Branches      213      213           
=======================================
  Hits          982      982           
  Misses        118      118           
  Partials       15       15           

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[Copilot]

Pull request overview

Aligns the repository’s AI tooling setup (Claude Code, GitHub Copilot, OpenAI Codex) by adding shared guardrails/preflight guidance, structured AI error logging, and standardized prompt/playbook entry points.

Changes:

• Add core AI workflow docs (CLAUDE.md, AGENTS.md) and a structured recurring-mistakes log (ERRORS.md).
• Add GitHub Copilot instruction file + prompt playbooks under .github/prompts/.
• Add editor recommendations (.vscode/) and update the README + PR template to reflect the unified AI setup.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
README.md	Replaces Claude-only section with a unified AI Setup table and keeps Claude skills list.
ERRORS.md	Introduces a structured log format for recurring AI mistakes.
CLAUDE.md	Adds Claude-focused canonical commands, guardrails, merge workflow, and DoD.
AGENTS.md	Adds agent guide with Codex routing and review severity convention.
.vscode/settings.json	Enables Copilot instruction files and language toggles in workspace settings.
.vscode/extensions.json	Recommends Copilot extensions for VS Code users.
.github/pull_request_template.md	Standardizes PR metadata + validation + guardrails checklist.
.github/prompts/verify.prompt.md	Adds “Verify” prompt entry pointing to the full skill playbook.
.github/prompts/feature.prompt.md	Adds “Feature” prompt entry pointing to the full skill playbook.
.github/prompts/create-module.prompt.md	Adds “Create module” prompt entry pointing to the full skill playbook.
.github/prompts/update-stack.prompt.md	Adds “Update stack” prompt entry pointing to the full skill playbook.
.github/prompts/naming.prompt.md	Adds “Naming” prompt entry pointing to the full skill playbook.
.github/copilot-instructions.md	Adds Copilot-specific guardrails, commands, prompt index, and naming rules.

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[Copilot]

Pull request overview

Copilot reviewed 14 out of 14 changed files in this pull request and generated 1 comment.

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[Copilot]

Pull request overview

Copilot reviewed 14 out of 14 changed files in this pull request and generated no new comments.