Add shell utility library for Ring hooks with RFC 8259 JSON escaping, hook utilities (stdin reading, JSON output), and context usage estimation with tiered warnings at 50%/70%/85% thresholds.
Include SQLite+FTS5 schema for artifact indexing with tables for handoffs, plans, continuity ledgers, queries, and learnings. Schema includes sync triggers, porter stemming, and convenience views for pattern analysis.
Also adds 8 implementation plans for the full context management system: macro architecture, shared infrastructure, artifact index, continuity ledger, handoff tracking, context warnings, RAG planning, and compound learnings.
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