feat: expand sudoku analysis and interoperability

CHANGELOG.md

@@ -16,6 +16,41 @@ All notable changes are documented here.
   constraint family.
 - Added bounded, seedable generation for classic and twelve variant families,
   plus independent uniqueness and evidence-based difficulty assessment.
+- 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
+  impossible decoy numbers and a setter-wide false-clue mode.
+- Added the original, uniquely verified “Truth and lies” example demonstrating
+  true and false outside, inclusion, maximum, cage, line and pair clues.
+- 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.
+- 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.
+- Added named savepoints, isolated hypothesis branches, keep/discard decisions
+  and read-only replay of complete solving states.
+- 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
+  interchange.
+- Added a generalized Sum Lab with independent digit bounds, repeats,
+  required/excluded digits, selected-cell candidates, positional assignments
+  and reversible manual eliminations.
+- Added Candidate Lab filters, selected/touching/specific-house scopes, house
+  positions, strong conjugate/bivalue links, weak links and bounded board
+  overlays.
+- 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 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.
+- Made Killer cage repeat semantics explicit in the setter and independent of
+  whether a clue is required to be true or false.
 
 ## 0.1.0 - 2026-08-30