Deep Mehta 4a8cf359fe Revert "Revert "feat: Add CacheProvider API for external distributed caching"" (#12915) ...

* Revert "Revert "feat: Add CacheProvider API for external distributed caching …"

This reverts commit d1d53c14be.

* fix: gate provider lookups to outputs cache and fix UI coercion

- Add `enable_providers` flag to BasicCache so only the outputs cache
  triggers external provider lookups/stores. The objects cache stores
  node class instances, not CacheEntry values, so provider calls were
  wasted round-trips that always missed.
- Remove `or {}` coercion on `result.ui` — an empty dict passes the
  `is not None` gate in execution.py and causes KeyError when the
  history builder indexes `["output"]` and `["meta"]`. Preserving
  `None` correctly skips the ui_node_outputs addition.

2026-03-12 21:17:50 -07:00

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