learn/: add 00-OVERVIEW, 01-CONCEPTS, 02-ARCHITECTURE, 03-IMPLEMENTATION, 04-CHALLENGES, and MECHANICS (the byte-by-byte crypto deep-dive). CONFORMANCE shipped in M11. Real-breach grounding, function/file code refs (no line numbers), no AI voice.
Project README: flip M0-stale to real M0-M11 (21 mechanisms, std.Io.randomSecure, roadmap done through M12, learn/ link table).
Root README: graduate HSM to a completed project (Full Source Code 32->33, C badge -> Zig, title + footer now link to source and learn/).
Verified docs-only: zig build test and zig build smoke both exit 0, smoke mechanisms=21, objdump -T shows only C_GetFunctionList. No source changed.
CarterPerez-dev