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/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} `;
+}