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feat: phase 10 — website updates, OpenAPI spec, final validation

feat: phases 7-9 — 34 new challenges, 18 docs, 4 course modules

docs: add CLAUDE.md for AI-assisted development context

docs: add CLAUDE.md for AI-assisted development context

docs: add CLAUDE.md for AI-assisted development context

docs: add CLAUDE.md for AI-assisted development context

fix: comprehensive remediation — security, coverage, race fixes, docs

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Add missing binary patterns to .gitignore

Remove large binary, update .gitignore, sync submodules

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fix: eliminate all unconditional test skips and fix rename detection bugs

feat: comprehensive test coverage, challenges, and documentation expansion

feat: comprehensive test coverage, challenges, and documentation expansion

Remove large binary, update .gitignore, sync submodules

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fix(database): add rows.Err() check in copyTableData

fix: eliminate all unconditional test skips and fix rename detection bugs

feat: comprehensive test coverage, challenges, and documentation expansion

feat: comprehensive test coverage, challenges, and documentation expansion

test: comprehensive challenge tests for CH-016 to CH-050

chore(submodules): update Lazy, Memory, and Recovery to latest

chore(submodules): update Lazy and Recovery to latest

chore(submodules): update all modules with website content and course outlines

chore(submodules): update Database and Concurrency with website/course docs

chore(submodules): update Database with SQL definitions docs

feat(challenges): add MOD-001 to MOD-015 module verification challenges

chore(submodules): update 10 modules with architecture documentation