docs(RMGR-WP-0001): complete T04 implementation foundation

Accept ADR-001: Python 3.12, FastAPI, Postgres/SQLAlchemy async, src layout,
uv/hatchling, pytest. Scaffold package, rmgr CLI stub, and version tests.

src/repo_manager/cli.py

@@ -0,0 +1,51 @@
+"""CLI entry point ``rmgr`` (skeleton — commands land with extract phases)."""
+
+from __future__ import annotations
+
+import argparse
+import sys
+
+
+def main(argv: list[str] | None = None) -> int:
+    parser = argparse.ArgumentParser(
+        prog="rmgr",
+        description="Repo Manager CLI (helixforge.repo-manager)",
+    )
+    parser.add_argument(
+        "--version",
+        action="store_true",
+        help="Print package version and exit",
+    )
+    sub = parser.add_subparsers(dest="command")
+
+    sub.add_parser("version", help="Print version")
+
+    # Placeholders — implemented as extraction phases land (RMGR-WP-0001-T05+).
+    p_rec = sub.add_parser(
+        "reconcile",
+        help="Run consistency reconcile (not yet implemented)",
+    )
+    p_rec.add_argument("--path", default=".", help="Repository checkout path")
+    p_rec.add_argument("--fix", action="store_true", help="Apply safe fixes")
+
+    args = parser.parse_args(argv)
+    if args.version or args.command in (None, "version"):
+        from repo_manager import __version__
+
+        print(__version__)
+        return 0
+
+    if args.command == "reconcile":
+        print(
+            "rmgr reconcile: not implemented yet "
+            "(see docs/adr-001-implementation-foundation.md, phase P0)",
+            file=sys.stderr,
+        )
+        return 2
+
+    parser.print_help()
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())