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## Why
Memory search currently supports either independent substring matches or
requiring every query to appear on the same line. That is too
restrictive for memory files where related terms often land on nearby
lines in the same note or bullet block.
## What changed
- Replace the old `all` match mode with explicit tagged modes:
`all_on_same_line` and `all_within_lines { line_count }`.
- Add windowed matching in `codex-rs/memories/mcp/src/local.rs` so
callers can require every query to appear within a bounded line range
while returning only the minimal qualifying windows.
- Reject invalid zero-width windows and update the MCP tool description
plus argument parsing to expose the new mode.
- Add coverage for same-line matching, windowed matching, and invalid
`line_count` input.
## Verification
- Added targeted coverage in `codex-rs/memories/mcp/src/local_tests.rs`
for `search_supports_all_within_lines_match_mode` and
`search_rejects_zero_line_window`.
- Added server-side parsing coverage in
`codex-rs/memories/mcp/src/server.rs` for
`search_args_accept_windowed_all_match_mode`.