`ValueError` from xorq swallows ibis fallback in `_create_connection_from_config`

[espenjutte]

While using boring-semantic-layer with plain ibis/bigquery I encountered a blocking bug when using with a bigquery backend. with a from_yaml. Claude suggested the following fix, but i don't know the wider rammifications on the general codebase, so i'l leave it here as a bug report. Here is a small simple setup with way to reproduce the error:

When using an inline profile: {type: bigquery} in a YAML model definition,
from_yaml crashes with a ValueError from xorq instead of falling back to
ibis.bigquery.connect().

_create_connection_from_config in profile.py already has the right ibis
fallback for backends xorq doesn't support — but the except clause only
catches AssertionError. For BigQuery (and potentially other backends), xorq's
validator raises ValueError, so the fallback is never reached.

The intent is clearly there — the comment even says "Backend not supported by
xorq (e.g. Databricks) — fall back to plain ibis" — but the wrong exception
type is caught.

To reproduce

# model.yaml
orders:
  profile:
    type: bigquery
  table: orders
  database:
    - bigquery-public-data
    - thelook_ecommerce
  dimensions:
    order_status: _.status
  measures:
    order_count: _.count()

from boring_semantic_layer import from_yaml

models = from_yaml("model.yaml")  # crashes here

Traceback:

File ".../boring_semantic_layer/yaml.py", line 297, in _load_table_for_yaml_model
    connection = get_connection(profile_config)
File ".../boring_semantic_layer/profile.py", line 57, in _connect_from_dict
    return _create_connection_from_config(config)
File ".../boring_semantic_layer/profile.py", line 134, in _create_connection_from_config
    xorq_profile = XorqProfile(con_name=conn_type, kwargs_tuple=kwargs_tuple)
File ".../xorq/vendor/ibis/backends/profiles.py", line 186, in validate_con_name
    raise ValueError(
ValueError: Unknown backend 'bigquery'; installed backends: ['databricks', 'datafusion',
'duckdb', 'gizmosql', 'pandas', 'postgres', 'pyiceberg', 'snowflake', 'sqlite', 'trino',
'xorq_datafusion']

Root cause

profile.py:136 catches AssertionError to trigger the ibis fallback, but
xorq's validate_con_name raises ValueError for unknown backends:

# profile.py — current (broken)
try:
    xorq_profile = XorqProfile(con_name=conn_type, kwargs_tuple=kwargs_tuple)
    connection = xorq_profile.get_con()
except AssertionError:   # <-- ValueError never caught, fallback never runs
    connect_fn = getattr(ibis, conn_type, None)
    ...
    connection = connect_fn.connect(**connect_kwargs)

One-line fix:

except (AssertionError, ValueError):