Add 4 new concept pages: Lisp vs Rust prover discussion, CL modernization initiative, corrected phases, timeline

concepts/cl-modernization-corrected-phases.org

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+:PROPERTIES:
+:CREATED:  [2026-06-03 Tue]
+:ID:       a6a04686-56d3-4cb0-9c3d-4722f8f586f3
+:END:
+#+title: CL Modernization — Corrected Phase Order
+#+filetags: :HOL:common-lisp:modernization:passepartout:theorem-proving:verification:
+
+* Corrected insight
+
+The prover must come first, not last. An unverified base can't bootstrap a verified upper layer. Every tool that the agent uses to build the next tool must itself be provably correct. The order flips from /easiest first/ to /most foundational first./
+
+* Corrected Phase Order
+
+** Phase 0: HOL Kernel (~500-800 lines of pure CL, verified by ACL2). The smallest, best-defined, highest-leverage artifact. Everything depends on it. A well-known mathematical specification (HOL Light's 10 primitive inference rules).
+
+** Phase 1: Minimal Verified Build System. Just enough to compile the prover and the LSP. Doesn't need to be Cargo-complete — needs to be verified.
+
+** Phase 2: Verified LSP Server. Surfaces SBCL's type inference backed by proofs.
+
+** Phase 3: Verified Language Extensions. Coalton, standard library, all proved correct.
+
+** Phase 4: Full Modernized CL Stack. Self-hosted, self-verifying.