Problem: `push_pass` updated all remote-linked tasks unconditionally, causing unnecessary API calls and potential clobbering of remote edits made between syncs. `pull`/`sync` never noticed when a task disappeared from remote. `update_event` omitted `transparency` that `create_event` set. Failure counts were absent from sync log summaries. Solution: Introduce `_gtasks_synced_at` in `_extra` — stamped after every successful push/pull create or update — so `push_pass` skips tasks unchanged since last sync. Add `detect_remote_deletions` to unlink local tasks whose remote entry disappeared from a successfully fetched list. Surface failures as `!N` in all sync logs and `unlinked: N` for pull/sync. Add `transparency = 'transparent'` to `update_event`. Cover new behaviour with 7 tests in `gtasks_spec.lua`. |
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