feat: complete advanced Sudoku workbench

CHANGELOG.md

@@ -4,6 +4,30 @@ All notable changes are documented here.
 
 ## Unreleased
 
+## 0.2.0 - 2026-08-31
+
+- Added staged guided hints that reveal focus, technique, reasoning and effects
+  before an explicit, undoable apply action.
+- Added legal centre-candidate filling, invalid note pruning and optional peer
+  note maintenance after placements; erasing a value never invents candidates.
+- Added Jellyfish, finned X-Wing/Swordfish, Skyscraper, Two-String Kite, Simple
+  Colouring, W-Wing, X-Chain, XY-Chain and alternating-inference-chain logical
+  steps with deterministic evidence.
+- Added Unique Rectangle only behind a completed exact uniqueness proof; a
+  truncated search never enables uniqueness-dependent logic.
+- Added quick and full setter-quality audits with ambiguity witnesses,
+  contradiction suspects, per-item critical/redundant/unknown findings, a cell
+  heatmap and optional bounded minimality proof.
+- Added explicit per-check and aggregate quality budgets, cancellation and
+  serializable check evidence so a capped search remains unknown rather than
+  becoming a false proof.
+- Added minimum, odd/even, disjoint-groups, little-killer and sandwich rules
+  across validation, candidate filtering, exact solving, rendering and setting.
+- Added between, German-whisper, region-sum, modular, entropic and zipper lines;
+  clone and extra regions; double arrows; and row, column and box indexers.
+- Added display-only Fog of War backed by a complete locally stored solution.
+  Only initial lights, givens and correctly entered values reveal cells; fog is
+  never treated as an extra solution constraint.
 - Added optional digit-completion counts with muted complete digits and red
   over-completion warnings.
 - Added toggleable Ctrl/Command-click matching-digit highlights without turning
@@ -12,10 +36,16 @@ All notable changes are documented here.
   remain accidentally active.
 - Replaced ambiguous V/X pair labels on the board with numbered 5/10 badges and
   gave inequalities a directional chevron with a marked lesser-value tip.
-- Added thirteen uniquely checked built-in examples covering every supported
-  constraint family.
-- Added bounded, seedable generation for classic and twelve variant families,
-  plus independent uniqueness and evidence-based difficulty assessment.
+- Added fourteen uniquely checked built-in examples covering the original core
+  constraint families.
+- Expanded bounded, seedable generation for classic and twelve variant families
+  with mixed-family recipes, sparse/balanced/dense clue controls and additional
+  reflection, diagonal and four-way clue symmetries.
+- Added explicit minimal-givens mode with proof/unknown reporting, deterministic
+  batches of up to 12 candidates and rankings by difficulty or clue count.
+- Added required/forbidden/minimum/maximum logical-technique profiles and an
+  exact hardest-technique target, accepted only against an independent complete
+  logical path and exact uniqueness check.
 - Added X-sum, skyscraper, quadruple and maximum-cell constraints across the
   model, validator, exact solver, renderer, setter and f-puzzles interchange.
 - Added per-clue false semantics for liar/Wrogn puzzles, including bounded
@@ -25,14 +55,30 @@ All notable changes are documented here.
 - Added outside-grid clue margins, combined dual X-sum/skyscraper labels,
   outward maximum arrows and visually distinct false clues.
 - Added strict, bounded local imports for SudokuPad/CTC data and supported
-  Penpa+ long links, including source reporting and explicit incompatibility
-  lists instead of silently discarded constructs.
+  Penpa+ long links, with a structured preview of mapped semantics, preserved
+  drawings, metadata and compatibility warnings.
+- Added a bounded inert visual model for f-puzzles and SCL lines, polylines,
+  rectangles, ellipses, circles and text; source identity, scalar metadata and
+  drawings survive edits, explicit saves, autosaves, reopening and project/share
+  round-trips without becoming rules, and render beneath Fog on the board.
+- Added SudokuPad/CTC JSON and self-contained `scl…` export with progress,
+  regions, cages and canonical constraint drawings, while rejecting negated
+  clues or free-form global rules it cannot preserve safely.
 - Added a compatibility check which never fetches SudokuPad short IDs or other
   server-hosted puzzle references.
 - Added standalone SVG, high-resolution PNG and single-page PDF visual exports
-  for supported constraints, givens and optional solving progress.
+  for supported constraints, safe preserved drawings, givens and optional
+  solving progress.
 - Added named savepoints, isolated hypothesis branches, keep/discard decisions
   and read-only replay of complete solving states.
+- Added debounced recovery snapshots for puzzle state, progress, aid-mémoire
+  and a validated, size-bounded gameplay history, with explicit restore/discard
+  handling after an interruption.
+- Upgraded the local Library with title/tag search, tag and completion filters,
+  safe grid thumbnails, tag editing and selected export, duplication or
+  confirmed deletion.
+- Added a relative-scope web app manifest and subpath-aware service worker with
+  an offline application-shell fallback after the first successful load.
 - Added an optional configurable aid-mémoire whose labelled scratch cells
   support values, both note styles and colours without constraining the puzzle;
   its state is preserved in undo, replay, Library progress and project/share
@@ -46,6 +92,13 @@ All notable changes are documented here.
 - Added technique-targeted practice generation which mines a bounded,
   deterministic set of uniquely checked puzzles and verifies the requested
   technique in the logical solve path.
+- Added a persisted 75–200% board viewport, Fit and board-scoped zoom shortcuts,
+  plus an announced Pan mode which pauses cell pointer targeting.
+- Added tap-toggle multi-selection and a single safe-area-aware sticky entry pad
+  at narrow widths, with touch-sized zoom controls.
+- Added eight hue-and-pattern colour marks, configurable off/concise/detailed
+  candidate narration, and fog-safe board, toolbar, helper and guided-hint
+  boundaries.
 - Added real ARIA row/gridcell semantics, detailed cell descriptions and
   non-wrapping Arrow, Home/End, Control/Command + Home/End and Page Up/Down
   keyboard navigation for the puzzle and scratch grids.