feat: implement Trello board management

Add 5 board management tools extending the Trello client:
- trello_create_board — create a new board
- trello_rename_board — rename an existing board
- trello_archive_board — close/archive a board
- trello_open_board — re-open a closed board
- trello_board_details — view board with lists and members

Includes board name-to-ID resolution, 16 new tests, and spec doc.

Issue: #2

src/trello_plugin/tools.py

@@ -76,6 +76,105 @@ def trello_disconnect() -> str:
     return _respond({"success": True, "message": "Trello credentials cleared from memory. Next tool call will re-read TRELLO_API_KEY and TRELLO_TOKEN from environment and reconnect automatically."})
 
 
+# ---------------------------------------------------------------------------
+# Tools — Board Management
+# ---------------------------------------------------------------------------
+
+
+def trello_create_board(name: str, default_lists: bool = True) -> str:  # noqa: FBT001, FBT002
+    """Create a new Trello board.
+
+    Parameters
+    ----------
+    name : str
+        The name for the new board.
+    default_lists : bool, optional
+        Whether to create default lists (default: True).
+
+    Returns
+    -------
+    str
+        JSON with board id, name, and URL on success.
+    """
+    client = _get_client()
+    result = client.create_board(name=name, default_lists=default_lists)
+    return _respond(result)
+
+
+def trello_rename_board(board_id: str, name: str) -> str:
+    """Rename an existing Trello board.
+
+    Parameters
+    ----------
+    board_id : str
+        Board ID or name.
+    name : str
+        The new name for the board.
+
+    Returns
+    -------
+    str
+        JSON with updated board details on success.
+    """
+    client = _get_client()
+    result = client.rename_board(board_id=board_id, name=name)
+    return _respond(result)
+
+
+def trello_archive_board(board_id: str) -> str:
+    """Close/archive a Trello board.
+
+    Parameters
+    ----------
+    board_id : str
+        Board ID or name.
+
+    Returns
+    -------
+    str
+        JSON with success message.
+    """
+    client = _get_client()
+    result = client.archive_board(board_id=board_id)
+    return _respond(result)
+
+
+def trello_open_board(board_id: str) -> str:
+    """Re-open a closed/archived Trello board.
+
+    Parameters
+    ----------
+    board_id : str
+        Board ID or name.
+
+    Returns
+    -------
+    str
+        JSON with success message.
+    """
+    client = _get_client()
+    result = client.open_board(board_id=board_id)
+    return _respond(result)
+
+
+def trello_board_details(board_id: str) -> str:
+    """View details of a Trello board, including its lists and members.
+
+    Parameters
+    ----------
+    board_id : str
+        Board ID or name.
+
+    Returns
+    -------
+    str
+        JSON with board details including lists and members.
+    """
+    client = _get_client()
+    result = client.board_details(board_id=board_id)
+    return _respond(result)
+
+
 # ---------------------------------------------------------------------------
 # Plugin metadata (used by Hermes plugin loader)
 # ---------------------------------------------------------------------------
@@ -87,6 +186,11 @@ PLUGIN_TOOLS = [
     trello_verify_credentials,
     trello_list_boards,
     trello_disconnect,
+    trello_create_board,
+    trello_rename_board,
+    trello_archive_board,
+    trello_open_board,
+    trello_board_details,
 ]
 PLUGIN_REQUIRES_ENV = ["TRELLO_API_KEY", "TRELLO_TOKEN"]