Record reproducible order-7 and order-8 measurements from the committed benchmark framework with a clean working tree. Include stable work counts, solve-time spread, validation and rendering cost, and interleaved instrumentation overhead.
Order 9 remains supported by the runner but retains its historical timing because each current run takes several minutes.
Benchmark: Apple arm64 Release, one warm-up, three repetitions
Refs: #8
Add an opt-in benchmark probe and JSON runner that separate solve, construction, validation, and rendering time. Record stable search counters, environment metadata, warm-up and repetition policy, timeouts, errors, median spread, and instrumentation overhead.
Compile production solving without counters and interleave counted and plain trials when measuring overhead. Keep heavyweight cases outside the default correctness path while testing counter and report behavior cheaply.
Tests: Debug and Release CTest suites (7 passed each)
Refs: #8
next_pos() returns the grid end sentinel when a placement completes the board. Avoid passing that sentinel to largest_square(), which requires an in-range position and otherwise reads past the grid.
Tests: Debug, Release, ASan, and UBSan CTest suites
Refs: #14
Exercise both the trivial order-1 solution and the feasible order-8 solution through the independent placement validator.
With the existing completion ordering, the focused test reports a heap-buffer-overflow under AddressSanitizer before validation can run.
Refs: #14
Check the character in the output string instead of referring to a nonexistent grid_ member. This restores Debug compilation while preserving the intended invariant that rendering must not write an identical character twice.
Size labels intentionally replace interior spaces, so requiring an entirely unwritten destination would reject valid solutions. Update the testing notes now that Debug builds pass.
Tests: Debug and Release CTest suites (4 passed each)
Refs: #7
Exercise Results::output() with the known order-8 fixture so Debug builds compile and run the rendering assertions. Check the output dimensions and ensure the valid tiling leaves no unrendered cells.
The test passes in Release and currently fails to compile in Debug because Results::set() refers to the nonexistent grid_ member.
Refs: #7
Establish a CTest harness before changing solver behavior. Validate board dimensions, multiplicities, bounds, overlap and coverage against independent placement data, including known order-8 and constructed order-9 fixtures.
Document Debug and sanitizer workflows while keeping the defects tracked by #7 and #14 separate. Prepare a result adapter so the feasible solver regression can be enabled with the completion fix.
Tests: Release, ASan and UBSan CTest suites (3 passed each)
Refs: #1
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