v0.6.3 — Store-quality loop and tuned defaults

• Minimal setup is now just the upstream block: every other setting ships with a working tuned default, with a full key-by-key table in the configuration docs.
• Read-only drill-down memory tools are exposed on memory-enabled requests out of the box; set the toggle to false to restore tool-free behavior on strict upstreams.
• Background learning defers while the upstream is busy, with a short idle grace, so deferred learning no longer competes with foreground traffic.
• Episodic discipline: near-verbatim episodic re-proposes are skipped deterministically, and stale never-reinforced episodic memories retire themselves on a bounded periodic pass (raw events untouched, topic summaries rebuilt).
• Consolidation gating fixed: the churn floor now gates the enqueue itself and checkpoints advance only on executed passes, so sub-floor churn accumulates toward a real pass instead of being discarded.
• New read-only GET /status: health plus store shape, durable-queue state, 7-day consolidation activity, and the episodic skip-guard counter.
• Long-lived databases: free pages left by the earlier event-compression migration can be reclaimed with a one-time manual VACUUM (never invoked by product code).