8a0329026c
- Replaced `LINE↑`/`LINE↓`/`A-B:` op sigils with unified `A-B:` anchor + `|`/`↑`/`↓` payload sigils. - Added `mode: "replacement"` tag to insert edits so the applier distinguishes replace-bucket from insert-bucket lines. - Removed lenient fallbacks (implicit continuation, inline payload acceptance, escaped delimiter stripping). - Updated grammar, prompt, tokenizer, parser, applier, and messages to match the new format.