docs(todo): split Implement ai-kb tasks into 1a/1b and fold in review-5 hardening

I reorganized the Implement ai-kb children into the Step 1a / 1b phases from the spec: 1a is the safe write path (store, contract, the index/lint/remember/doctor CLI, the adapter, provisioning), and 1b is query/curate/sync, the push timer, and the curation workflow. The remember task now gates the commit on the full ai-kb lint rather than node org-lint, the test tasks target the org-lint fatal-check list and the query --json contract, the push task carries the failure-observability surfaces, and the pointer convention is ID-first throughout.

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