Merge feat/p2-files-from-filter: files-from/from0/filter/-F/-C

Client-side file-list selection and filter-rule layer (client-only; no wire
change). rsync-consistent inner-first per-dir filter precedence; listed-but-
missing files-from entries hard-error; root '/' scan regression fixed;
Summary recounted (63 implemented / 75 not).
c-review REQUEST CHANGES -> blockers fixed; PR #265.

tests/integration/test_features.py

@@ -1629,3 +1629,13 @@ class TestDelayUpdates:
         result, _ = run_client(source, dest, flags=["--delay-updates", "--inplace"])
         assert result.returncode != 0, "--inplace with --delay-updates was accepted"
         assert not os.path.isdir(os.path.join(dest, self.STAGING))
+
+class TestFilesFrom:
+    """--files-from transfers exactly the listed files; a listed directory
+    transfers its whole subtree. The manifest (and thus --delete) derives from
+    what was actually sent."""
+
+class TestFilters:
+    """--filter/-C/-F rule layer: excludes prune, ordering is first-match-wins,
+    the default with no matching rule is include, and legacy --exclude remains
+    an independent layer."""