Implement the RSYNC_COMPAT Phase-2 filter/parser feature group:
- --files-from=FILE (repeatable) plus -0/--from0 NUL delimiters: parse the
source file list relative to the source root into a shared read-only
allow-set; the scanner transfers listed files and the whole subtree of
listed directories and prunes everything else in single- and
multithreaded mode. Absolute/'..' entries and missing files are hard
CLI errors.
- --filter=RULE: rsync-style +/- rules (anchored '/', dir-only trailing '/',
word include/exclude forms) evaluated first-match-wins with a default of
include, as an independent layer from legacy --exclude/--include.
Unsupported directives (merge/hide/... ) are rejected explicitly. -f stays
sendfile.
- -C/--cvs-exclude: well-known rsync CVS default exclude set.
- -F: per-directory .rsync-filter files read during traversal and applied to
the owning directory's subtree (single + parallel), never transferred.
- Delete manifest still derives from what was actually sent.
Client-only config fields; no wire/protocol change. Adds unit coverage
(CLI parse, allow-set and filter scanning single+parallel) and integration
tests (TestFilesFrom, TestFilters). RSYNC_COMPAT matrix rows updated:
5 rows move to Implemented (Summary 62/3/5/1/76 = 147).
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