chore: rewrite README for mini-claude-code project, remove unrelated files

feat(docs): polish all tutorials — add architecture diagram, fix mermaid charts, align terminology

docs(02): remove async/factory/CLI sections — not introduced until later chapters

docs(01): rewrite — focus on provider routing, remove Tier section

docs: convert all code to pseudocode, remove project-specific details

docs: remove project-specific customizations, keep universal design principles

docs: final polish pass — purge remaining implementation details

docs: rename 07-compression to 07-memory, purge CLI/implementation details

docs: unify navigation links, tool names, and fix framework term leakage

docs: purge implementation details, restore pure design narrative

docs: fix TodoList narrative across 04/07/08 — visibility gap, not data loss

docs(04): fix TodoList state description — remove CLI detail, use accurate terminology

docs: fix 4 low-priority issues from quality review

docs: fix two medium-priority issues from quality review

docs: 5-angle deep review — fix progressive disclosure, code accuracy, and transitions