Implement scope arrest and semantic anchors (#23)

This commit establishes the f0 (control pass) foundation per the scope
arrest directive, including:

## Machine-Readable Control Files (.machine_read/)
- LLM_SUPERINTENDENT.scm: AI assistant guidance and constraints
- SPEC.core.scm: Minimal formal language specification
- ROADMAP.f0.scm: Quarantined future work with phase definitions

## Conformance Test Suite (conformance/)
- 12 valid programs testing core syntax constructs
- 12 invalid programs testing error diagnostics
- Placeholder .expected files for golden outputs
- README documenting test methodology

## License Coherence
- Consolidate LICENSE.txt into LICENSE as canonical
- Update dune-project to MIT OR AGPL-3.0-or-later
- Update Cargo.toml to match project license
- Add/update SPDX headers in all source files:
  - OCaml: lib/*.ml, bin/main.ml, test/*.ml
  - Rust: runtime/src/*.rs

## Task Runner (justfile)
- Add actual dune commands for build/test/lint/clean
- Add lex/parse commands for CLI invocation
- Add golden-path recipe for smoke testing
- Add conformance recipe for running conformance tests

This establishes the f0 baseline where OCaml/Dune implementation
behavior is authoritative. Future phases (f1-f4) are quarantined in
ROADMAP.f0.scm.

Co-authored-by: Claude <noreply@anthropic.com>

Author: hyperpolymath

.machine_read/LLM_SUPERINTENDENT.scm

@@ -0,0 +1,214 @@
+;; SPDX-License-Identifier: MIT OR AGPL-3.0-or-later
+;; SPDX-FileCopyrightText: 2024-2025 hyperpolymath
+;;
+;; LLM_SUPERINTENDENT.scm - AI/LLM Interaction Guidelines for AffineScript
+;;
+;; This file provides machine-readable guidance for AI assistants working
+;; on this repository. It defines constraints, priorities, and behavioral
+;; expectations aligned with the scope arrest directive.
+
+(define llm-superintendent
+  '((schema . "hyperpolymath.llm-superintendent/1")
+    (repo . "hyperpolymath/affinescript")
+    (updated . "2026-01-01")
+
+    ;; =========================================================================
+    ;; IDENTITY & SCOPE
+    ;; =========================================================================
+    (identity
+      . ((project . "AffineScript")
+         (type . "programming-language-compiler")
+         (current-phase . "f0-control-pass")
+         (one-sentence . "OCaml/Dune compiler frontend for AffineScript, a language with affine types, dependent types, row polymorphism, and extensible effects targeting WASM.")))
+
+    ;; =========================================================================
+    ;; SCOPE ARREST - WHAT THIS REPO IS AND IS NOT
+    ;; =========================================================================
+    (scope
+      . ((is
+           . ("A programming language specification"
+              "An OCaml/Dune compiler frontend (lexer, parser, type checker)"
+              "A CLI tool with lex/parse/check/compile subcommands"
+              "A conformance test suite"
+              "Documentation for the language"))
+         (is-not
+           . ("A framework"
+              "A standard library (stdlib is separate)"
+              "A package registry"
+              "An IDE or editor"
+              "A build system (beyond the compiler itself)"))))
+
+    ;; =========================================================================
+    ;; F0 CONTROL PASS - AUTHORITATIVE BEHAVIOR
+    ;; =========================================================================
+    (f0-authority
+      . ((primary-authority . "OCaml/Dune implementation behavior")
+         (binding-artifacts
+           . ("CLI exit codes and output format"
+              "Diagnostic message structure"
+              "Conformance test corpus"
+              "Golden test outputs"))
+         (non-binding-in-f0
+           . ("Type system implementation details (many TODOs)"
+              "Borrow checker implementation (skeleton only)"
+              "Code generation (not implemented)"
+              "Runtime behavior (Rust runtime is quarantined)"))))
+
+    ;; =========================================================================
+    ;; ALLOWED MODIFICATIONS
+    ;; =========================================================================
+    (allowed-modifications
+      . ((encouraged
+           . ("Bug fixes to lexer/parser"
+              "Completing TODO items in type checker"
+              "Adding conformance tests"
+              "Improving error messages"
+              "Adding SPDX headers where missing"
+              "Documentation improvements"))
+         (permitted-with-justification
+           . ("New CLI subcommands"
+              "Parser grammar extensions"
+              "Type system feature implementation"))
+         (requires-explicit-approval
+           . ("Changing the language semantics"
+              "Adding new language keywords"
+              "Changing diagnostic formats (breaks conformance)"
+              "Modifying golden test expected outputs"))
+         (forbidden
+           . ("Adding a second authoritative implementation"
+              "Moving semantic authority away from OCaml reference"
+              "Introducing TypeScript as implementation language"
+              "Network-required builds/tests"
+              "Feature expansion not required for golden path"
+              "Adding frameworks or unnecessary dependencies"))))
+
+    ;; =========================================================================
+    ;; IMPLEMENTATION CONSTRAINTS
+    ;; =========================================================================
+    (implementation
+      . ((primary-language . "OCaml")
+         (build-system . "Dune 3.14 + Menhir 3.0")
+         (required-ocaml-version . ">= 5.1")
+         (allowed-languages
+           . (("OCaml" . "Compiler implementation")
+              ("Scheme" . "Machine-readable control plane files")
+              ("Just" . "Task runner glue")))
+         (quarantined
+           . (("Rust" . "WASM runtime - not authoritative in f0")))
+         (forbidden
+           . ("TypeScript" "Go" "Python (except SaltStack)"))))
+
+    ;; =========================================================================
+    ;; GOLDEN PATH REQUIREMENTS
+    ;; =========================================================================
+    (golden-path
+      . ((commands
+           . ("dune build"
+              "dune runtest"
+              "dune exec affinescript -- lex examples/hello.as"
+              "dune exec affinescript -- parse examples/ownership.as"))
+         (success-criteria
+           . ("Build succeeds on clean machine with OCaml toolchain"
+              "All tests pass"
+              "CLI commands work on shipped examples"
+              "Invalid programs produce deterministic diagnostics"))
+         (exit-codes
+           . ((success . 0)
+              (parse-error . 1)
+              (type-error . 2)
+              (internal-error . 255)))))
+
+    ;; =========================================================================
+    ;; CONFORMANCE REQUIREMENTS
+    ;; =========================================================================
+    (conformance
+      . ((directory . "conformance/")
+         (structure
+           . ((valid-programs . "conformance/valid/")
+              (invalid-programs . "conformance/invalid/")
+              (golden-outputs . "conformance/*.expected")))
+         (minimum-counts
+           . ((valid-programs . 10)
+              (invalid-programs . 10)))
+         (test-requirements
+           . ("Each program has .expected file with golden output"
+              "Exit codes are deterministic"
+              "Diagnostic messages match expected patterns"))))
+
+    ;; =========================================================================
+    ;; LICENSING
+    ;; =========================================================================
+    (licensing
+      . ((spdx-identifier . "MIT OR AGPL-3.0-or-later")
+         (canonical-file . "./LICENSE")
+         (header-format
+           . ";; SPDX-License-Identifier: MIT OR AGPL-3.0-or-later\n;; SPDX-FileCopyrightText: 2024-2025 hyperpolymath")
+         (enforcement
+           . ("All source files MUST have SPDX headers"
+              "All license declarations MUST agree"
+              "No contradictory license files"))))
+
+    ;; =========================================================================
+    ;; BEHAVIORAL GUIDELINES FOR AI ASSISTANTS
+    ;; =========================================================================
+    (llm-behavior
+      . ((always
+           . ("Read existing code before modifying"
+              "Check conformance impact of changes"
+              "Preserve existing behavior unless explicitly changing it"
+              "Add tests for new functionality"
+              "Use consistent code style with existing codebase"
+              "Check for TODO comments and address them appropriately"))
+         (never
+           . ("Guess at language semantics"
+              "Modify golden test outputs without justification"
+              "Add dependencies not strictly necessary"
+              "Introduce TypeScript or forbidden languages"
+              "Over-engineer solutions"
+              "Add features beyond what was requested"))
+         (prefer
+           . ("Minimal changes that achieve the goal"
+              "Reusing existing patterns in the codebase"
+              "Clear error messages over clever code"
+              "Completing existing TODOs over new features"))))
+
+    ;; =========================================================================
+    ;; KEY FILES
+    ;; =========================================================================
+    (key-files
+      . ((implementation
+           . ("lib/lexer.ml"       ;; Sedlex lexer
+              "lib/parser.mly"     ;; Menhir grammar
+              "lib/parse_driver.ml" ;; Parser integration
+              "lib/ast.ml"         ;; AST definitions
+              "lib/token.ml"       ;; Token types
+              "lib/span.ml"        ;; Source locations
+              "lib/error.ml"       ;; Diagnostics
+              "lib/typecheck.ml"   ;; Type checker (WIP)
+              "lib/unify.ml"       ;; Type unification (WIP)
+              "lib/borrow.ml"      ;; Borrow checker (stub)
+              "bin/main.ml"))      ;; CLI
+         (specification
+           . ("affinescript-spec.md"  ;; Language spec
+              ".machine_read/SPEC.core.scm"))  ;; Formal core
+         (machine-readable
+           . (".machine_read/LLM_SUPERINTENDENT.scm"
+              ".machine_read/SPEC.core.scm"
+              ".machine_read/ROADMAP.f0.scm"))
+         (tests
+           . ("test/test_lexer.ml"
+              "test/test_parser.ml"
+              "test/test_golden.ml"
+              "conformance/"))))
+
+    ;; =========================================================================
+    ;; FUTURE PHASES (NOT F0)
+    ;; =========================================================================
+    (future-phases
+      . ((f1 . "Complete type checker + borrow checker")
+         (f2 . "WASM code generation")
+         (f3 . "Standard library")
+         (f4 . "Tooling (LSP, package manager)")))))
+
+;; Export for machine consumption
+(define (get-superintendent) llm-superintendent)