feat(backlog): add the metrics synthesis step to org-roam

"synthesize backlog metrics" reads the JSONL union across personal projects and computes the per-run rollups, the trends, and the corrections signal (a later revert or fix touching an autonomous commit's files within ~14 days, a flag for review rather than a conviction). It writes one :agent:metrics: KB node linking back to prior synthesis nodes. Work and unknown projects are excluded by the denylist classification and reported per the refusal contract.

The step is read-only over the logs plus the single KB write. It never mutates the JSONL, todo.org, or any project tree.

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