Wrap connection and TLS errors from RemoteClient as NetworkError

[pcbeingused333]

Problem

RemoteClient._request wraps requests.exceptions.Timeout as NetworkError, but re-raises ConnectionError and SSLError unchanged:

except requests.exceptions.SSLError:
    raise
except requests.exceptions.ConnectionError:
    raise
except requests.exceptions.Timeout as exc:
    raise NetworkError(...) from exc

The two except X: raise clauses are no-ops. fenn.exceptions.NetworkError is documented as "The remote host could not be reached", and the CLI only handles the typed errors:

• fenn run — except RemoteError (NetworkError is a subclass)
• fenn auth — except (NetworkError, RemoteError)

So a DNS failure, refused connection, or bad TLS certificate when talking to pyfenn.com escapes as a raw requests traceback instead of the intended Remote error: ... message and clean exit.

Fix

Wrap ConnectionError and SSLError in NetworkError too, keeping distinct wording (Could not connect to ... / TLS error connecting to ...) and chaining the original with from exc. SSLError stays a separate clause (it's a ConnectionError subclass) so its message is kept.

Tests

tests/unit/remote/test_client.py — the first tests for RemoteClient: transport errors (connection / SSL / connect-timeout / read-timeout) all raise NetworkError; a 200 still returns; 401/402 still map to AuthError / InsufficientCreditsError. The connection/SSL/connect-timeout cases raise raw requests exceptions on main.

Verified: pytest tests/unit — 924 passed; ruff check/format and ty check fenn/remote/client.py clean. (The pre-commit CI job is red on a pre-existing ty failure in fenn/experimental/vision/normalize.py and fenn/logging.py, unrelated to this change.)

[pcbeingused333]

The pre-commit check is red on the ty hook, pre-existing on main (commit 0d1862e fails the same job on fenn/experimental/vision/normalize.py and fenn/logging.py, neither touched here). ruff check / ruff format and ty check fenn/remote/client.py are clean locally; the test jobs are the relevant ones.