refactor(codemode): split runtime into focused interpreter modules

[rekram1-node]

What

Split src/interpreter/runtime.ts (3,840 lines, one ~2,900-line Interpreter class) into focused modules. runtime.ts is now 1,955 lines of the coupled tree-walk core.

Module	Lines	Contents
interpreter/runtime.ts	1,955	Statements, expressions, member access, call dispatch, function invocation
interpreter/methods.ts	819	String/Array/Map/Set/URLSearchParams method dispatch
interpreter/promises.ts	336	Promise lifecycle, combinators, chaining, and construction
interpreter/execute.ts	224	Execution shell, parsing, and output bounds
interpreter/references.ts	99	Runtime-reference classification and cycle rejection
interpreter/errors.ts	93	Error normalization and sandbox error values
interpreter/scope.ts	84	Scope stack
stdlib/console.ts	122	Pure console formatting

Cleanup

• Inject narrow callback/runtime capabilities instead of passing the interpreter through extracted modules.
• Remove blanket filesystem-path rewriting from safe tool errors and console logs; unknown host failures remain sanitized at the tool boundary.
• Remove obsolete trimLeft, trimRight, and Annex B substr support.
• Enable noUnusedLocals for the package.
• Reduce source comments from roughly 500 lines to roughly 110, retaining public API JSDoc and non-obvious security, ordering, and mutation invariants.

Verification

• Independent move-accounting, code-quality, cleanup, and semantic-diff reviews found no unintended regressions.
• 782 CodeMode tests pass.
• CodeMode typecheck and formatting pass.
• Push hook passed all 31 repository package typechecks.