fix(cli): address review findings on session commands

- Replace # type: ignore[assignment] with cast() (F1/L1)
- Fix show command format check to include COLOR variant (H1/F3)
- Remove unnecessary AttributeError from all 7 catch tuples (F2)
- Add CHANGELOG.md entry for session DI fix (F4)

Refs: #554, #570

CHANGELOG.md

@@ -2,6 +2,19 @@
 
 ## Unreleased
 
+- Fixed `agents session list`, `agents session create`, and other session
+  subcommands raising `AttributeError: 'DynamicContainer' object has no
+  attribute 'db'` after `agents init`.  Root cause: `_get_session_service()`
+  called `container.db()` but no `db` provider existed.  Added a
+  `session_service` DI provider in `container.py` that builds the engine,
+  sessionmaker, and auto-committing repositories.  Rewrote
+  `_get_session_service()` to resolve via the container with module-level
+  caching.  Added `auto_commit` parameter to `SessionRepository` and
+  `SessionMessageRepository` to prevent resource leaks in CLI context while
+  preserving Unit-of-Work semantics.  Unified error handling across all 7
+  session subcommands.  Includes Behave BDD regression scenarios, Robot
+  Framework integration smoke tests, and structlog isolation for parallel
+  test execution.  (#554, #570, #680)
 - Added TDD-style failing Behave BDD tests for the session list DI container
   missing `db` provider bug.  Three scenarios exercise `session list`,
   `_get_session_service()`, and `session list --format json` through the real

src/cleveragents/cli/commands/session.py

@@ -14,7 +14,7 @@ import logging
 import sys
 from collections import OrderedDict
 from pathlib import Path
-from typing import Annotated, Any
+from typing import Annotated, Any, cast
 
 import typer
 from rich.console import Console
@@ -60,7 +60,7 @@ def _get_session_service() -> SessionService:
     from cleveragents.application.container import get_container
 
     container = get_container()
-    svc: SessionService = container.session_service()  # type: ignore[assignment]
+    svc = cast(SessionService, container.session_service())
     _service = svc
     return _service
 
@@ -153,7 +153,7 @@ def create(
     except SessionNotFoundError as exc:
         console.print(f"[red]Error:[/red] {exc}")
         raise typer.Exit(1) from exc
-    except (DatabaseError, AttributeError) as exc:
+    except DatabaseError as exc:
         _log.debug("session create failed", exc_info=True)
         console.print(
             f"[red]Error:[/red] Database unavailable: {exc}\n"
@@ -181,7 +181,7 @@ def list_sessions(
     try:
         service = _get_session_service()
         sessions = service.list()
-    except (DatabaseError, AttributeError) as exc:
+    except DatabaseError as exc:
         _log.debug("session list failed", exc_info=True)
         console.print(
             f"[red]Error:[/red] Database unavailable: {exc}\n"
@@ -255,7 +255,7 @@ def show(
         session = service.get(session_id)
         data = session.as_cli_dict()
 
-        if fmt != OutputFormat.RICH.value:
+        if fmt not in (OutputFormat.RICH.value, OutputFormat.COLOR.value):
             typer.echo(format_output(dict(data), fmt))
             return
 
@@ -327,7 +327,7 @@ def show(
     except SessionNotFoundError as exc:
         console.print(f"[red]Session not found:[/red] {session_id}")
         raise typer.Exit(1) from exc
-    except (DatabaseError, AttributeError) as exc:
+    except DatabaseError as exc:
         _log.debug("session show failed", exc_info=True)
         console.print(
             f"[red]Error:[/red] Database unavailable: {exc}\n"
@@ -373,7 +373,7 @@ def delete(
     except SessionNotFoundError as exc:
         console.print(f"[red]Session not found:[/red] {session_id}")
         raise typer.Exit(1) from exc
-    except (DatabaseError, AttributeError) as exc:
+    except DatabaseError as exc:
         _log.debug("session delete failed", exc_info=True)
         console.print(
             f"[red]Error:[/red] Database unavailable: {exc}\n"
@@ -432,7 +432,7 @@ def export_session(
     except SessionExportError as exc:
         console.print(f"[red]Export error:[/red] {exc}")
         raise typer.Exit(1) from exc
-    except (DatabaseError, AttributeError) as exc:
+    except DatabaseError as exc:
         _log.debug("session export failed", exc_info=True)
         console.print(
             f"[red]Error:[/red] Database unavailable: {exc}\n"
@@ -483,7 +483,7 @@ def import_session(
     except SessionImportError as exc:
         console.print(f"[red]Import error:[/red] {exc}")
         raise typer.Exit(1) from exc
-    except (DatabaseError, AttributeError) as exc:
+    except DatabaseError as exc:
         _log.debug("session import failed", exc_info=True)
         console.print(
             f"[red]Error:[/red] Database unavailable: {exc}\n"
@@ -558,7 +558,7 @@ def tell(
     except SessionNotFoundError as exc:
         console.print(f"[red]Session not found:[/red] {session_id}")
         raise typer.Exit(1) from exc
-    except (DatabaseError, AttributeError) as exc:
+    except DatabaseError as exc:
         _log.debug("session tell failed", exc_info=True)
         console.print(
             f"[red]Error:[/red] Database unavailable: {exc}\n"