fix(server): load only due tasks during scheduler ticks

[saphid]

The five-second scheduler tick decoded every task, including disabled and future tasks. Query only enabled, due, non-running rows through the existing partial due-task index. Preserve task order and lenient handling of malformed due rows; API listing and one-time startup recovery retain their full reads.

Rebuilt head f4b5f8a06 targets V2 3aa47e294, with test-only prerequisite #10865 (merge first). Two-file topic, no schema changes.

Validation: all seven focused scheduler/query tests pass, including index selection, malformed records, running/disabled/future rows. Server typecheck, targeted lint and formatting pass. No live state writes. New CI pending. Direct Claude Opus 5 high review remains unavailable because OAuth expired (latest launch exited 1 before inference).

Targets V2 #2829. Updated with GPT-6 in Codex/T3.

[cursor]

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[macroscopeapp]

Macroscope has since reviewed this pull request. An earlier review was skipped by a cost limit; a review has now completed, so that notice no longer applies.

[macroscopeapp]

Approvability

Verdict: Approved at f4b5f8a

Macroscope's review found this PR approvable — This is a focused scheduler optimization that moves existing due-task filtering into an indexed query while preserving lenient decoding and existing task behavior. Added tests cover the relevant task states, and no product defaults or production interfaces are changed.

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Dismissing prior approval to re-evaluate d05a0ba

Dismissing prior approval to re-evaluate ebc4cd5