When users delete local BME IndexedDB via UI actions (delete current/all
IDB), the chat metadata's st_bme_commit_marker was not cleared. This left
an accepted high-revision promise with no local DB backing, causing
persist-mismatch:indexeddb-behind-commit-marker and blocking graph load
indefinitely.
- index.js: add clearCurrentChatCommitMarker() helper and expose via runtime
- ui-actions-controller.js: call clearCurrentChatCommitMarker before
syncGraphLoadFromLiveContext after IDB deletion
- p0-regressions.mjs: regression test asserting marker is cleared before
reload after current-IDB deletion
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