Type checker and interpreter refactors

[figgleforth]

Type Checker

The existing Type_Checker stub has been fleshed out into a real static analysis pass that runs before interpretation. It
checks:

• Annotated assignments x: String = 123 raises Type_Mismatch
• Typed function parameters with defaults go { x: Number = 'bad'; x } is caught at compile time
• Call-site argument types, when a function has annotated params, argument types are verified at call sites

The checker does full AST traversal (functions, types, conditionals, loops, directives, etc.), and silently skips anything it can't statically infer (e.g., identifiers with unknown types). A new type_checker_test.rb covers 30+ cases across happy paths and mismatches at the top level, inside functions, types, and conditionals.

A new Type_Mismatch < Type_Checking_Failed error carries the declared and inferred types. Type_Checking_Failed now holds the list of errors it accumulated.

Interpreter Refactors

Several cleanup passes landed alongside the type checker:

• #find_ruby_class_for_type — replaced two near-identical blocks of Ruby class resolution logic with a single helper
• #track_static_declaration — deduplicated three copies of the ./ scope operator check into one method
• #check_dot_access_permissions! — renamed with ! to signal it raises
• @cd directive — now non-destructive: wraps the target in a Temporary < Scope scope with the target as a sibling, rather than pushing the target directly onto the stack (eliminates the cd_scopes set)
• For loop stride — collapsed two parallel if stride / else blocks into a single unified chunks.each loop
• While/until loops — extracted shared iteration logic into on_skip_handler and iteration_proc procs, removing duplicated catch :skip blocks
• Standard library loading is simplified: no longer spawns a temporary Interpreter to load preload.ore; loads directly into the global scope
• Ore::Return extracted to its own file, no longer subclass of Scope
• Server_Runner → User_Server
• Extracted build_ore_request and build_ore_response helpers
• Simplified the DOM onclick path to reuse interp_route_handler instead of manual scope push/pop.

bin/ore

Default invocation (ore <file>) now calls interp_file directly instead of hot-reload. Hot-reload moved to an explicit run subcommand.