docs: add chapters 04-06 (AI core series)#6
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Add three new articles to the Claude Code CLI source study series: - Chapter 04: System Prompt Engineering — covers the two-phase prompt assembly architecture (static/dynamic boundary for cache optimization), the systemPromptSection/DANGEROUS_uncachedSystemPromptSection caching system, 4-block splitSysPromptPrefix() cache splitting, internal vs external prompt variants, prompt priority hierarchy, and fork subagent byte-exact prompt reuse. - Chapter 05: Query Loop — analyzes query.ts's AsyncGenerator state machine driving the full AI interaction cycle, including streaming tool execution, auto-compact pipeline, error recovery with withhold/ resume pattern, and the multi-stage context compression chain. - Chapter 06: Context Management — details the token budget system, auto-compact threshold calculation, compact/microcompact/reactive- compact strategies, and FileStateCache LRU optimization. Also updates: - plan.md: corrected key file lists for chapters 04-06 based on actual source code analysis - Chapters 01-03: minor path reference updates - TOC (chapter 00): removed hardcoded output path references Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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These three chapters complete Part 2 (AI Core) of the book series. Chapter 04 was further refined based on detailed review feedback addressing 7 accuracy issues (missing sections, cache block structure, fork subagent path, etc.).
Also includes minor updates to plan.md (corrected key file lists) and chapters 01-03 (path reference cleanup).
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