feat: MVP — move files, rewrite imports, atomically

- core: gitignore-aware index (ignore crate), forward/reverse import graph,
  relative-specifier math, pure-data move plans
- apply: rewrite-first + rename-last with fsync, temp+rename, full rollback
  (incl. stale-plan detection before any write); unified diff for dry-run
- cli: mv + check commands, human output, --json envelope with stable error
  codes (SOURCE_NOT_FOUND, TARGET_EXISTS, ...) and hints; exit codes 0/1/2
- parser/core split into submodules to keep files <=250 lines
- tests: 37 unit + 10 e2e + 2 doctests; fixtures tests/typescript/{basic,normal,complex}
- docs: SKILL.md synced (no --force in Phase 1), EXAMPLES.md
- plan: AI/agent support done; Phase 1.5 = Java niche

tests/typescript/basic/app.ts

@@ -0,0 +1,5 @@
+import { sum } from "./lib/sum";
+
+export function main(): number {
+  return sum(1, 2);
+}

tests/typescript/basic/lib/sum.ts

@@ -0,0 +1,3 @@
+export function sum(a: number, b: number): number {
+  return a + b;
+}

tests/typescript/basic/package.json

@@ -0,0 +1 @@
+{ "name": "basic" }

tests/typescript/complex/package.json

@@ -0,0 +1 @@
+{ "name": "complex" }

tests/typescript/complex/src/broken.ts

@@ -0,0 +1,6 @@
+// Fixture with one intentionally broken relative import.
+
+export const flag = true;
+import { ghost } from "./gone";
+
+export const who = ghost;

tests/typescript/complex/src/config.ts

@@ -0,0 +1,3 @@
+import { trim } from "./util/../util/text";
+
+export const DEFAULT = trim("  hi  ");

tests/typescript/complex/src/engine/index.ts

@@ -0,0 +1,5 @@
+import { trim } from "../util/text";
+
+export function solve(input: string): string {
+  return trim(input);
+}

tests/typescript/complex/src/ui/deep/nested/view.ts

@@ -0,0 +1,7 @@
+import {
+  pad,
+} from "../../../util/text";
+
+export function render(value: string): string {
+  return pad(value);
+}

tests/typescript/complex/src/util/text.ts

@@ -0,0 +1,7 @@
+export function trim(s: string): string {
+  return s.trim();
+}
+
+export function pad(s: string): string {
+  return ` ${s} `;
+}

tests/typescript/normal/.gitignore

@@ -0,0 +1 @@
+node_modules/

tests/typescript/normal/package.json

@@ -0,0 +1 @@
+{ "name": "normal" }

tests/typescript/normal/src/app.ts

@@ -0,0 +1,14 @@
+import type { Thing } from "./types";
+import express from "express";
+import "./impl/core";
+import { log } from "./utils/logger";
+
+const cfg = require("./types");
+const later = () => import("./types");
+
+export const app = express();
+export function render(t: Thing): string {
+  log(cfg.name, t.id);
+  return t.id;
+}
+export { later };

tests/typescript/normal/src/impl/core.ts

@@ -0,0 +1,3 @@
+export function compute(x: number): number {
+  return x * 2;
+}

tests/typescript/normal/src/impl/index.ts

@@ -0,0 +1 @@
+export * from "./core";

tests/typescript/normal/src/index.ts

@@ -0,0 +1 @@
+export * from "./impl";

tests/typescript/normal/src/types.ts

@@ -0,0 +1,3 @@
+export interface Thing {
+  id: string;
+}

tests/typescript/normal/src/utils/logger.ts

@@ -0,0 +1,3 @@
+export function log(...parts: unknown[]): void {
+  void parts;
+}