Implement SplitNTermLevels transform with tests

[AlanPietrasz]

#8
Implemented SplitNTermLevels transform.
Added Level comparison/toString methods.
Added tests for splitting productions by level and forwarding tags/actions.

[ppolesiuk]

Thanks! The algorithm looks good. I've found one bug related to handling tag conditions and I have some other minor comments, shown below.

[Copilot]

Pull request overview

Implements the SplitNTermLevels transform (issue #8), which splits each non-terminal into one non-terminal per production-level and inserts forwarding productions that carry tags from the level above. Also adds Level comparison/toString methods, a unit-test suite for the transform, and a minimal bash test runner / harness.

Changes:

• Add equal, lt, le, and toString methods on Level.
• Implement Transform/SplitNTermLevels.transform: collect distinct production levels per non-terminal, allocate fresh NTermIds per (NTerm, level), rewrite PS_NTerm symbols to point at the correct split, and emit forwarding productions between adjacent levels carrying the upper level's tags.
• Add test/TransformTests/SplitNTermLevels.fram with four test cases, plus test/TestAll.fram, test/test_suite, and a test.sh bash harness.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
src/Repr/Common/Level.fram	Adds equal/lt/le/toString methods on Level.
src/Transform/SplitNTermLevels.fram	Full implementation of the level-splitting transform replacing the prior stub.
test/TransformTests/SplitNTermLevels.fram	New unit tests covering NTerm count per level, retention of original productions, forwarding productions, and tag forwarding.
test/TestAll.fram	Aggregates test modules; currently imports the new SplitNTermLevels tests.
test/test_suite	Declares a framyard_tests suite that runs TestAll.fram with -L src -L test.
test.sh	New bash test driver that locates dbl/DBL_LIB, sources a test_suite file, and reports pass/fail counts.

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