- Added `replace block N:` syntax in grammar/parser/tokenizer/types, emitting `kind: "block"` edits with empty-body checks.
- Added block-resolution in hashline apply/recovery, wiring `BlockResolver` to resolve edits with throw/drop unresolved behavior.
- Added native `blockRangeAt` support and exported block range/options types through pi-ast, pi-natives, and JS bindings.
- Added coding-agent resolver wiring plus internal visibility/exports updates and new parser, patcher, and setup-wizard tests.
- Replaced bare `A B` range headers with `replace N..M:`, `delete N..M`, `insert before N:`, `insert after N:`, `insert head:`, and `insert tail:`.
- Removed `&A..B` repeat rows; insert-before/after ops now express the same intent explicitly.
- Empty replace bodies now error instead of deleting; `delete` is the canonical deletion op.
- Updated grammar, prompt, docs, tests, and all call sites to the new syntax.
- Added a `hashRecognized` field to `MismatchDetails` and `MismatchError`, defaulting it to `true` for compatibility.
- Updated stale mismatch rejection messaging to distinguish drifted hashes from session-absent hashes with explicit guidance.
- Propagated `hashRecognized: snapshot !== null` in `Patcher` and added tests for both mismatch branches.
- Rejected bare `A` anchors; single-line ranges must now be spelled `A A`.
- Added a descriptive error for single-number headers to guide model output.
- Updated grammar, tokenizer, prompt docs, and tests to reflect the change.
- Redesigned hashline patch syntax from anchor-based (`A-B:`) to hunk-header format (`@@ A..B @@`) with unified-diff compatibility.
- Removed `autoDropPureInsertDuplicates` option and simplified apply behavior to preserve duplicated boundary and context lines.
- Changed repeat operator from `^A-B` to `&A..B` and range separator from `-` to `..` for consistency with hunk-header syntax.
- Added image resizing and dimension notes to eval tool output; improved write tool hashline header sanitation for legacy formats.
- Removed 521 lines of boundary-duplicate absorption code and simplified parser to auto-convert bare body rows and unified-diff contamination.
- Replaced 4-hex content-derived file hashes with 3-hex opaque tags minted by InMemorySnapshotStore, making tags session-bound pointers rather than content fingerprints.
- Removed lru-cache dependency; replaced LRU-bounded per-path rings with a flat 4096-slot global ring using a scrambled permutation to prevent LLM tag extrapolation.
- Made SnapshotStore required in Patcher (was optional); tag resolution now drives stale-anchor detection instead of recomputing hashes at apply time.
- Changed literal payload sigil from `|` to `+` and accepted `^A` shorthand for `^A-A`; added lenient recovery for bare bodies, lone `-` rows, and overlapping bare/concrete block pairs.
- Added a dedicated @oh-my-pi/hashline package with parser, patcher, filesystem, snapshots, and release metadata.
- Migrated coding-agent hashline and stream entrypoints to @oh-my-pi/hashline and removed old hashline module exports.
- Changed multi-section hashline execution to validate section hashes and flush diagnostics only at the final commit.
- Added session fileSnapshotStore support and rewired edit/read/search/write tools to use it instead of fileReadCache.
- Changed multiline payload syntax so continuation lines must start with `+`; that prefix is stripped before writing.
- Raw unprefixed lines after an op now throw an error instead of being silently accepted as payload.
- Removed `PAYLOAD_LINE_PREFIX_DEMOTED_WARNING` and the nested-replace demotion path; inner `N:` ops inside a pending `A-B:` now raise an overlap error.
- Raw blank lines between ops are ignored; use `+` alone for an empty payload line.
- Changed identical `A-B:` duplicate ops to last-wins coalesce with a warning, fixing spurious anchor-conflict errors when models emit before/after pairs.
- Non-identical overlap shapes (different ranges, replace+delete, delete+delete) still throw.
- Added new file hash line to edit tool result output after successful apply.
- Replaced per-line hash anchors with file-level hash validation in hashline format, changing anchor syntax from LINE+HASH to bare LINE numbers.
- Simplified hashline line separator from pipe (|) to colon (:) and replaced replace operator (->) with colon, added delete operator (!) for explicit line deletion.
- Implemented file-read snapshot caching with multi-snapshot ring buffer per path and file-hash-based recovery to detect and recover from stale edits.
- Refactored hashline grammar, parser, and execution to support file-level hash binding, anchor-scoped validation, and structural bracket warnings for delete operations.
- Updated documentation and test fixtures to reflect new hashline syntax with file hashes, colon separators, and delete operator throughout.
- Removed vim edit mode and automatically map existing vim configurations to hashline mode.
- Deleted VimTool class, VimEngine implementation, and all vim-specific editing logic (2409 lines).
- Removed vim mode from EditMode union type, edit tool strategies, and configuration schemas.
- Deleted vim parser, command handler, buffer manager, and renderer modules.
- Updated documentation and tests to remove vim mode references and add deprecation mapping.
- Updated hashline markers to `¶` headers and `^/v/->` operators across constants, prompts, docs, and tests.
- Reworked hashline grammar and parser to support `ANCHOR<SIGIL>[INLINE_PAYLOAD]` with optional inline bodies and `A-B` ranges.
- Changed range and marker syntax from `..`/`"` to `-` and suffix `^/v/->` forms like `7v` and `A->`.
- Aligned `sameLineRange()` output and BOF/EOF handling so `|TEXT` remains cosmetic and payload now follows the op line.
- Centralized op-line detection by replacing local regex helpers with `isHashlineOpLineText` for payload terminator and bad-op checks.
- Changed hashline format to canonical `§` section headers and `"`/`"`/`≔` operations across grammar, parser, and docs.
- Reworked range and op parsing so single anchors are valid, legacy `-`/`-=` ops error, and empty `≔` payloads now delete ranges.
- Removed legacy `HL_EDIT_SEP`, `$HSEP$`, and `hsep` plumbing, adopting raw payload lines.
- Updated execution, input, renderer, and streaming flows to use `HL_FILE_PREFIX` and `HL_OP_CHARS` helpers.
- Updated session-stats parsing to `§`/`≔`/`"`/`"` format, patch envelopes, and bumped parser versions.
- Removed the hashline-separator benchmark script and its PI_HL_SEP job orchestration.
- Updated hashline section parsing to accept headers with any leading `@` characters, normalizing them to the path before validation.
- Updated the hashline grammar and fallback errors to use canonical `@@ PATH` section headers.
- Added coverage for mixed `@@` and `@@@` headers across multiple file sections in hashline parsing tests.
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