feat(bot): клиент SourceCraft API — прогоны, логи кубов, sha коммита, ретраи

- SourceCraftClient (httpx): list_runs, get_run, get_cube_logs (постранично), run_commit_sha;
  ретраи на сетевые ошибки и 5xx с экспоненциальной задержкой, 4xx — SourceCraftError без повторов
- модели: RunStatus/EventType из swagger, «1970-01-01» = не задано, failed_cubes без служебных #-кубов
- у прогона в API нет sha → куб check/meta в tgit-uploads печатает TGIT_COMMIT_SHA (ADR-014)
- CLI: python -m app.sourcecraft.cli runs
- тесты на реальных ответах API (фикстуры), порог покрытия 45 → 80

Refs #10

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app/config.py

@@ -49,6 +49,18 @@ class DatabaseSettings(BaseSettings):
     url: str = "sqlite+aiosqlite:///./tgit.db"
 
 
+class SourceCraftSettings(BaseSettings):
+    model_config = SettingsConfigDict(**_ENV, env_prefix="SOURCECRAFT_")
+
+    token: SecretStr = SecretStr("")
+    api_url: str = "https://api.sourcecraft.tech"
+    uploads_repo: str = "rogachevegorushka/tgit-uploads"
+    # Web link to a CI run. The SPA answers 200 on any path, so the format is unverified — adjust if it 404s in UI.
+    run_url_template: str = "https://sourcecraft.dev/{repo}/cicd/runs/{run}"
+    timeout: float = Field(default=30.0, gt=0)
+    max_attempts: int = Field(default=5, ge=1)
+
+
 class RuntimeSettings(BaseSettings):
     model_config = _ENV
 
@@ -68,4 +80,5 @@ class Settings(BaseSettings):
     access: AccessSettings = Field(default_factory=AccessSettings)
     database: DatabaseSettings = Field(default_factory=DatabaseSettings)
     llm: LLMSettings = Field(default_factory=LLMSettings)
+    sourcecraft: SourceCraftSettings = Field(default_factory=SourceCraftSettings)
     runtime: RuntimeSettings = Field(default_factory=RuntimeSettings)