fix(gc): use path helpers throughout; prune stale remote tracking refs under --full
Replace two hardcoded .muse/ path constructions with the canonical helpers from muse.core.paths: - _collect_shelf_objects: repo_root / MUSE_DIR / 'shelf.json' → _shelf_json_path(repo_root) - _collect_reachable_commits: repo_root / MUSE_DIR / 'tags' → _tags_dir(repo_root)
Remove now-unused MUSE_DIR import from muse.core.gc.
Add prune_stale_remote_refs(): when a remote is removed from config, its tracking-ref directory (.muse/remotes/<remote>/) accumulates indefinitely. Under muse gc --full, this function deletes directories for remotes not present in config.toml. Symlinked dirs are skipped (traversal guard). GcResult gains stale_remote_refs_collected and stale_remote_refs_bytes. CLI --full output and --json schema include the new counts.
Add test_gc_path_helpers_and_remote_refs.py: 16 tests covering path-helper correctness, prune_stale_remote_refs unit cases (stale deleted, configured preserved, dry_run, symlink guard, empty dir, nested layout, byte counting), and CLI integration (--full removes stale refs, --json schema, --dry-run, no --full leaves refs alone, zero-stale schema).
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