- 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.
- Removed `path` field from hashline input parameters and function signatures across diff, execute, and params modules.
- Updated HashlinePatch.parse() calls to omit the path option, relying on the ¶PATH#HASH header in input instead.
- Removed unused warning tracking for escaped payload delimiters in hashline parser.
- Added detection and stripping of extra backslashes before indented payload rows, which models often emit when JSON-escaping the delimiter.
- Added `_input` field alias support in hashlineEditParamsSchema to accept provider-emitted variants.
- Added warning message for escaped payload delimiter acceptance to guide users toward canonical syntax.
- Added `parsePatchStreaming` and `Executor.endStreaming` to handle in-flight ops gracefully during incremental parsing, dropping pending ops with no payload to avoid phantom edits.
- Introduced `PatchSection.applyPartialTo` as a streaming-aware counterpart to `applyTo`, using the new streaming parser for diff preview generation.
- Removed the custom `buildHashlineNaturalOrderPreviews` function and replaced it with calls to `applyPartialTo`, centralizing streaming logic in the parser layer.
- Simplified `renderSection` output assembly in hashline execution to stop injecting a separate headline.
- Removed conditional headline generation that prefixed create/update/status text before the header.
- Returned tool results containing only header, preview, and warnings content blocks.
- Preflighted write policies for all sections before any commit in multi-section batches.
- Rejected duplicate canonical targets (e.g., `a.ts` and `./a.ts`) before writes begin.
- Fixed `after_anchor` normalization mutating cached edits across repeated patch applications.
- Fixed `detectLineEnding` to use first-occurrence style instead of majority vote.
- 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.
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