v1.0.0

Initial release.

• Hot layer (~600 chars) with a promotion-candidate area that does not count toward the budget.
• Cold layer: one file per day under cold/YYYY-MM, appended with ISO timestamps, cross-month keyword recall.
• Extractive day -> week -> month summaries with fixed character budgets; never invents content.
• Six host tools: mem_hot_get, mem_hot_set, mem_write, mem_recall, mem_summarize, mem_stats.
• Smoke tests covering over-limit hints, dedupe, candidates, cross-month recall, all three summary layers and process-restart persistence.