test(coverage): add Behave BDD tests to improve coverage across 52 source files

Added 52 new .feature files and corresponding _steps.py files targeting
previously uncovered code paths in the following areas:

- TUI layer: app, commands, persona (state/schema/registry), widgets,
  input (shell_exec, reference_parser)
- Application services: plan lifecycle/service/executor, session,
  project, repo indexing, correction, checkpoint, actor, llm_actors,
  strategy coordinator, resource file watcher, service retry wiring
- CLI commands: session, resource, repl, plan, db, automation_profile
- Domain models: retry_policy, resource_type, cost_budget,
  docker_compose_analyzer, detail_level, _sql_string_aware,
  _postgresql_helpers
- Core: circuit_breaker, retry_service_patterns
- Infrastructure: repositories, transaction_sandbox, strategy_registry,
  plugins/loader, container
- Config: settings
- Agents: plan_generation, context_analysis, auto_debug
- A2A: facade

All new tests follow the Behave/Gherkin BDD standard. Resolved step
definition collisions with unique prefixes. Fixed Alembic fileConfig
logger disabling issue (disable_existing_loggers=False).

ISSUES CLOSED: #1068

features/steps/database_infrastructure_steps.py

@@ -669,11 +669,10 @@ def step_verify_plan_has_id(context):
     assert context.created_plan.id is not None
 
 
-# Removed - conflicts with container steps
-# @when("I retrieve the plan by ID")
-# def step_db_retrieve_plan_by_id(context):
-#     """Retrieve plan by ID."""
-#     context.retrieved_plan = context.plan_repo.get_by_id(context.created_plan.id)
+@when("I retrieve the plan by ID")
+def step_db_retrieve_plan_by_id(context):
+    """Retrieve plan by ID."""
+    context.retrieved_plan = context.plan_repo.get_by_id(context.created_plan.id)
 
 
 @then("I should get the correct plan back")