Return whether the session usage table should be rendered.
Controlled by [ui].show_usage_stats or DEEPAGENTS_CODE_SHOW_USAGE_STATS.
Both the TUI teardown and the headless run call this rather than resolving
the option themselves, so the key and its fallback pair are written once
and the two surfaces cannot disagree about the default.
Fails open: both callers are at teardown, where an exception would cost far more than the table is worth, so a broad catch is warranted for a leaf, cosmetic decision with a safe default — provided it is logged rather than swallowed. The call sites document what an escape would actually break.
BlockingError is excluded from that fail-open, matching
configurable_model._resolve_openai_prompt_cache_key_enabled: it signals
blocking I/O on the event loop, which is a real regression rather than a
config hiccup, and this is called directly from the async headless
teardown. It is matched by class name because blockbuster is not a
runtime dependency of this package.
The config_manifest import is deliberately outside the try, so an
ImportError propagates instead of being reported as a config failure.
