feat: fix engine (Phase 1.6) + git-aware mv + windows-safe path output

- Edit engine: generic span edits (replace/insert/delete) with stale-index
  guard; mv and fix share one atomic apply/rollback/diff/--json pipeline
- jmove mv|check|fix commands; java rules: unused-import, missing-import
  (unique-FQN insert, ambiguous -> candidates for agents), import-order
  (google style; cross-rule byte conflicts prune by severity and converge)
- mv of tracked files goes through git mv (staged rename, --no-git opt-out,
  moved_via/would_move_via in --json, GIT_ERROR code)
- fix java extract_package losing single-segment packages (bare identifier,
  not scoped_identifier) — broke the FQN index for 'package p;' projects
- core::rel_str: project-relative paths rendered with '/' on every platform
  (human/JSON/diff headers/git pathspecs), Path::display() no longer used
  for output; e2e fixtures: java/fix, java/fix_missing, java/order

src/lib.rs

@@ -1,14 +1,16 @@
-//! `jmove` — a project-aware file mover for TypeScript/JavaScript and Java.
+//! `jmove` — a project-aware file mover and import fixer for
+//! TypeScript/JavaScript and Java.
 //!
 //! Moving a file inside a project invalidates every relative import that
 //! points at it. `jmove` indexes the project's import graph, computes the
 //! minimal set of specifier rewrites, and applies everything atomically
-//! (with rollback), optionally in dry-run mode.
+//! (with rollback), optionally in dry-run mode. The same engine drives
+//! `fix`, which auto-repairs small import problems via deterministic rules.
 //!
 //! Module map:
 //! - [`cli`] — argument parsing, command dispatch, user-facing output.
-//! - [`core`] — indexing, dependency graph, move planning, atomic apply.
-//! - [`parser`] — language frontends (import extraction, path resolution).
+//! - [`core`] — indexing, dependency graph, move/fix planning, atomic apply.
+//! - [`parser`] — language frontends (import extraction, path resolution, fix rules).
 //! - [`cache`] — on-disk index cache (Phase 2, intentionally empty for now).
 
 pub mod cache;