725cb89899
- Added `sed` atom editing with `g`, `i`, and `F` flags, path/anchor parsing, and conflict handling updates. - Changed hashline and grep/read output to `LINE+ID|content` with `>` match prefixes and `:` context prefixes. - Fixed atom anchor parsing for path-qualified locs, hyphenated single anchors, and content hints after `|` or `:`. - Updated prompts, changelog, and tests to document and validate the new hashline and `sed` formats.