Josh Lehman 228448e6b3 docs: add context engine documentation ...

Add dedicated docs page for the pluggable context engine system:
- Full lifecycle explanation (ingest, assemble, compact, afterTurn)
- Legacy engine behavior documentation
- Plugin engine authoring guide with code examples
- ContextEngine interface reference table
- ownsCompaction semantics
- Subagent lifecycle hooks (prepareSubagentSpawn, onSubagentEnded)
- systemPromptAddition mechanism
- Relationship to compaction, memory plugins, and session pruning
- Configuration reference and tips

Also:
- Add context-engine to docs nav (Agents > Fundamentals, after Context)
- Add /context-engine redirect
- Cross-link from context.md and compaction.md

2026-03-17 00:14:51 -07:00

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