eval-hs helper + generator fixes — 304/941 (32%)
Added eval-hs: compile and evaluate HS expressions/commands, used by
conformance-dev tests. Smart wrapping: adds 'return' prefix for
expressions, leaves commands (set/put/get/then/return) as-is.
Fixed generator ref() to use context-aware variable mapping.
304/941 with the user's conformance-dev.sx tests included (110 new).
Failure breakdown: 111 stubs, 74 "bar" (eval errors), 51 assertion
failures, 30 eval-only stubs, 24 undefined "live", 18 parser errors.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
giles
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