Implement a complete Menhir parser covering:

Expressions:
- Literals (int, float, string, char, bool, unit)
- Variables and field access
- Binary operators with correct precedence
- Unary operators (negation, not, ref, deref)
- Function calls and indexing
- Tuples, arrays, and records
- If/else and match expressions
- Lambda expressions
- Blocks and let bindings
- Effect handlers and resume

Types:
- Simple types and type constructors
- Generic types (Option[T], Vec[n, T])
- Function types with optional effects
- Tuple and record types
- Row polymorphism ({x: Int, ..r})
- Ownership modifiers (own, ref, mut)

Patterns:
- Wildcards, variables, literals
- Constructor patterns
- Tuple and record patterns
- Or-patterns and binding patterns

Declarations:
- Functions (with total, generic, effects)
- Structs and enums
- Type aliases
- Traits and implementations
- Effect declarations
- Imports and modules

Also includes:
- Parse driver bridging sedlex and Menhir
- Comprehensive parser test suite (60+ tests)
- CLI integration for 'parse' command

…ructure

Phase 2 implementation of AffineScript:

REPL & Interpreter:
- value.ml: Runtime value representation with linear tracking
- eval.ml: Tree-walking interpreter with pattern matching
- repl.ml: Interactive REPL with commands (:help, :env, :debug, etc.)
- stdlib.ml: Standard library modules (Math, String, Array, Option, Result)

Semantic Analysis:
- symbol.ml: Symbol table with scope management
- resolve.ml: Name resolution pass for all AST nodes
- types.ml: Internal type representation (QTT quantities, rows, effects)
- typecheck.ml: Bidirectional type checker with unification
- borrow.ml: Affine type borrow checker (use-after-move detection)

Code Generation:
- codegen.ml: WebAssembly code generator (WAT output)

CLI Updates:
- Added 'repl', 'run', and 'eval' commands
- Integrated stdlib prelude loading

Examples:
- hello.afs, fibonacci.afs, factorial.afs
- higher_order.afs, records.afs, enums.afs

Tests:
- test_eval.ml: 35+ interpreter tests

Add comprehensive compiler infrastructure:
- lib/wasm_binary.ml: Full WASM binary encoder with LEB128, sections
- lib/dependent.ml: Dependent types (length-indexed vectors, refinements)
- lib/effects.ml: Algebraic effects and handlers runtime
- lib/package.ml: Package manager with semver, dependency resolution
- lib/lsp.ml: Language Server Protocol implementation

Add standard library in library/:

Common library (library/common/):
- prelude.afs: Core types (Option, Result), traits (Eq, Ord, Iterator)
- collections.afs: Vec, HashMap, HashSet, LinkedList, BinaryHeap
- io.afs: IO effect, file handling, streams, buffered I/O
- async.afs: Futures, channels, async primitives
- string.afs: String utilities, StringBuilder
- math.afs: Math functions, constants, statistics, RNG
- time.afs: Duration, Instant, DateTime
- sync.afs: Atomics, spinlocks, RwLock, barriers

AffineScript-specific library (library/affinescript/):
- linear.afs: Linear types, tokens, session types
- effects.afs: Effect handlers (Reader, Writer, State, Except)
- ownership.afs: Box, Rc, Weak, Cow, RefCell
- refinements.afs: Positive, NonZero, Vec[N,T], Matrix[M,N,T]

Total: ~8400 lines of new code