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* fix(core): harden text-measurement caches; surface snapshot failures Deep-dive findings, all three latent on every 24/7 install: - font_manager.metrics_cache and display_manager._text_width_cache were unbounded dicts keyed by (text, id(font)). Two problems: keys embed the measured TEXT, so ever-changing strings (a clock, a live score, a ticker) grow them without limit; and id()-keying without holding a reference means a garbage-collected font's id can be recycled by a DIFFERENT font, silently returning wrong widths/metrics (classic plugins create fonts per render, so this is reachable). Both caches are now LRU-bounded (1024) and pin the font in the entry so its id stays valid. metrics_cache also keyed on the text itself instead of hash(text), removing a collision path. - _write_snapshot_if_due logged failures at DEBUG — invisible at the default level. The snapshot's mtime is the web UI's display mirror AND its hardware-liveness proxy, so a quiet failure freezes the mirror and makes health checks lie (seen in the field: a stale root-owned /tmp file froze it for a day). Failures now WARN, rate- limited to once per 5 minutes. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FqzC1nzTWL4kaqgMaQZFam * test: sync mock cache manager signature with CacheManager.get test_circuit_breaker has been failing on main: plugin_health passes memory_ttl= to cache_manager.get(), and the conftest mock's signature was never updated — the same component/double drift class as the monitored_update bug (#392). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FqzC1nzTWL4kaqgMaQZFam --------- Co-authored-by: Chuck <chuck@example.com> Co-authored-by: Claude Fable 5 <noreply@anthropic.com>