docs: reconcile roadmap with shipped v1.2 Workflows track
The blueprint, CLAUDE.md, and the groups design doc still described the Workflows track as "not-yet-started" and listed a per-app `materialized` column as deferred — both stale. Workflows shipped M1–M6 (DAG execution + conditional `when`, nested sub-workflows, durable orchestrator, `workflow::start` SDK + admin API + `pic workflows`, dashboard DAG + run-history; migrations 0071/0072), and D1's `materialized` column shipped. Update the status lines to mark Workflows shipped (leaving §9.4 service interceptors as the one remaining Workflows-track item and cluster mode as next), bump the "migrations through 0070" note to 0072, and drop the stale `materialized`-deferred line. Docs-only. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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