Enriched default_atomic_factory with Kronecker, mirror, upscale, stack, symmetry transforms

Add 19 new transforms: Kronecker, mirror tiles, upscale, gravity, color ops, crop, transpose

Major update: fix wrong target, dual-strategy beam search, 19 new transforms, σ=0 achieved\n\n- Fixed wrong target for example1 (4 cells off vs real ARC task 007bbfb7)\n- Added dual-strategy beam: tries transforms on both resized AND original input\n- Added 19 new transforms: Kronecker, mirror tiles, upscale, gravity, color ops\n- Solver now achieves σ=0 on all 6 pairs of ARC task 007bbfb7"

Fix #8: Delete old README.md.md (replaced by README.md)

Fix #8: Rename README.md.md to README.md in itt_solver/

Fix #7: Remove committed .pyc files from repo

Fix #2: Clean up duplicate imports and paste blocks in solver_core.py

Fix #1: Remove duplicate Transform class, import from solver_core

Fix #3: Fix lambda closure bug in default_atomic_factory — capture target_shape by value

Fix #4: Fix wandb generate_id crash — use string directly instead of int(id, 36)

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