docs(release): v3.8.0 documentation overhaul (FIX 1-9)

Root docs
- GEMINI.md: remove plaintext credential (Hard Rule 1) and refresh references
- CLAUDE.md: update coverage gate to 75/75/75/70, add module counts for v3.8.0
- SECURITY.md: add Supported Versions section
- AGENTS.md: refresh counts (177 providers, 37 MCP tools, 14 strategies, 5 A2A skills, 3 cloud agents) and module map
- CONTRIBUTING.md: align coverage gate, Node range, conventional-commit scopes
- CODE_OF_CONDUCT.md: refresh contact
- llm.txt: refresh Node range, provider/tool/strategy counts, add v3.8.0 highlights and documentation index
- Tuto_Qdrant.MD -> Tuto_Qdrant.md (rename + dormant-integration status banner)

i18n strict mirrors
- docs/i18n/<40 locales>/llm.txt: refresh body to match root (preserving locale header + flags line + --- separator)

Cross-references
- docs/MEMORY.md, docs/REPOSITORY_MAP.md: update Tuto_Qdrant.md path and note dormant status
- Cleanup: remove .issues/feat-batch-delete-provider-accounts.md and docs/archive/RFC-AUTO-ASSESSMENT-DRAFT.md (already absent)

Agent workflows / skills / commands
- .claude/commands/*-cc.md, .agents/workflows/*-ag.md, .agents/skills/*/SKILL.md:
  - Replace ghost tools: search_web -> WebSearch, read_url_content -> WebFetch,
    view_file -> Read, write_to_file -> Write
  - notify_user -> mandatory stop checkpoints
  - version-bump / generate-release: 2.x.y -> 3.x.y, expand docs table to 28 entries,
    mark /update-docs and /update-i18n as deprecated
  - capture-release-evidences / review-discussions: tool-mapping notes for
    browser_subagent (mcp__claude-in-chrome__* and gh CLI)
  - review-prs: align coverage thresholds (>=75/>=70, ~82% measured)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

CONTRIBUTING.md

@@ -108,7 +108,7 @@ test: add observability unit tests
 refactor(db): consolidate rate limit tables
 ```
 
-Scopes: `db`, `sse`, `oauth`, `dashboard`, `api`, `cli`, `docker`, `ci`, `mcp`, `a2a`, `memory`, `skills`.
+Scopes (v3.8): `db`, `sse`, `oauth`, `dashboard`, `api`, `cli`, `docker`, `ci`, `mcp`, `a2a`, `memory`, `skills`, `cloud-agent`, `guardrails`, `compression`, `auto-combo`, `resilience`, `providers`, `executors`, `translator`, `domain`, `authz`.
 
 ---
 
@@ -208,7 +208,7 @@ src/                        # TypeScript (.ts / .tsx)
 ├── mitm/                   # MITM proxy (cert, DNS, target routing)
 ├── shared/
 │   ├── components/         # React components (.tsx)
-│   ├── constants/          # Provider definitions (60+), MCP scopes, routing strategies
+│   ├── constants/          # Provider definitions (177), MCP scopes, 14 routing strategies
 │   ├── utils/              # Circuit breaker, sanitizer, auth helpers
 │   └── validation/         # Zod v4 schemas
 └── sse/                    # SSE proxy pipeline