feat(M1): échafaudage et outillage complétés

- .pre-commit-config.yaml : hooks ruff, mypy, bandit, detect-secrets, whitespace
- .secrets.baseline : baseline detect-secrets (faux positif GUIDE_DEV_PYTHON.md)
- pyproject.toml : migration clés ruff vers [tool.ruff.lint], exclusion guide du format
- pip install -e ".[dev]" : dépendances installées dans le venv
- pre-commit install : hook git installé
- TODO.md : items M1 cochés

Validations :
- ruff check . : PASS
- ruff format --check . : PASS
- mypy . : PASS (17 fichiers)
- pytest : PASS (0 test, infrastructure OK)
- bandit -r pronote_sync/ : PASS
- pre-commit run --all-files : 9 passed, 1 skipped, 0 failed
- import pronote_sync : OK

Co-authored-by: OpenCode/orchestrator <opencode-orchestrator@agents.invalid>

.secrets.baseline

@@ -0,0 +1,144 @@
+{
+  "version": "1.5.0",
+  "plugins_used": [
+    {
+      "name": "ArtifactoryDetector"
+    },
+    {
+      "name": "AWSKeyDetector"
+    },
+    {
+      "name": "AzureStorageKeyDetector"
+    },
+    {
+      "name": "Base64HighEntropyString",
+      "limit": 4.5
+    },
+    {
+      "name": "BasicAuthDetector"
+    },
+    {
+      "name": "CloudantDetector"
+    },
+    {
+      "name": "DiscordBotTokenDetector"
+    },
+    {
+      "name": "GitHubTokenDetector"
+    },
+    {
+      "name": "GitLabTokenDetector"
+    },
+    {
+      "name": "HexHighEntropyString",
+      "limit": 3.0
+    },
+    {
+      "name": "IbmCloudIamDetector"
+    },
+    {
+      "name": "IbmCosHmacDetector"
+    },
+    {
+      "name": "IPPublicDetector"
+    },
+    {
+      "name": "JwtTokenDetector"
+    },
+    {
+      "name": "KeywordDetector",
+      "keyword_exclude": ""
+    },
+    {
+      "name": "MailchimpDetector"
+    },
+    {
+      "name": "NpmDetector"
+    },
+    {
+      "name": "OpenAIDetector"
+    },
+    {
+      "name": "PrivateKeyDetector"
+    },
+    {
+      "name": "PypiTokenDetector"
+    },
+    {
+      "name": "SendGridDetector"
+    },
+    {
+      "name": "SlackDetector"
+    },
+    {
+      "name": "SoftlayerDetector"
+    },
+    {
+      "name": "SquareOAuthDetector"
+    },
+    {
+      "name": "StripeDetector"
+    },
+    {
+      "name": "TelegramBotTokenDetector"
+    },
+    {
+      "name": "TwilioKeyDetector"
+    }
+  ],
+  "filters_used": [
+    {
+      "path": "detect_secrets.filters.allowlist.is_line_allowlisted"
+    },
+    {
+      "path": "detect_secrets.filters.common.is_ignored_due_to_verification_policies",
+      "min_level": 2
+    },
+    {
+      "path": "detect_secrets.filters.heuristic.is_indirect_reference"
+    },
+    {
+      "path": "detect_secrets.filters.heuristic.is_likely_id_string"
+    },
+    {
+      "path": "detect_secrets.filters.heuristic.is_lock_file"
+    },
+    {
+      "path": "detect_secrets.filters.heuristic.is_not_alphanumeric_string"
+    },
+    {
+      "path": "detect_secrets.filters.heuristic.is_potential_uuid"
+    },
+    {
+      "path": "detect_secrets.filters.heuristic.is_prefixed_with_dollar_sign"
+    },
+    {
+      "path": "detect_secrets.filters.heuristic.is_sequential_string"
+    },
+    {
+      "path": "detect_secrets.filters.heuristic.is_swagger_file"
+    },
+    {
+      "path": "detect_secrets.filters.heuristic.is_templated_secret"
+    },
+    {
+      "path": "detect_secrets.filters.regex.should_exclude_file",
+      "pattern": [
+        "\\.venv/.*",
+        "\\.git/.*"
+      ]
+    }
+  ],
+  "results": {
+    "GUIDE_DEV_PYTHON.md": [
+      {
+        "type": "Hex High Entropy String",
+        "filename": "GUIDE_DEV_PYTHON.md",
+        "hashed_secret": "90bd1b48e958257948487b90bee080ba5ed00caa",
+        "is_verified": false,
+        "line_number": 5073
+      }
+    ]
+  },
+  "generated_at": "2026-09-05T17:53:24Z"
+}