Major compliance fixes for running Gerry Jackson's core.fr tests:
- >IN synchronization: outer interpreter reads >IN back from WASM memory
after each word, enabling TESTING and other >IN-manipulating words
- RSHIFT changed to logical (unsigned) shift per Forth 2012 spec
- +LOOP uses boundary-crossing termination check for negative steps
- HEX/DECIMAL compile as WASM primitives (work inside definitions)
- BASE read from WASM memory for all number formatting
- Pictured numeric output: <# # #S #> HOLD SIGN
- New words: 2@ 2! .( ] ArithRshift
- Error recovery resets compile state on failure
- FIND reads counted strings from WASM memory
- Forth 2012 core.fr: 58 errors remaining (from unable-to-load)
ok2
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