giles 4c4806c8dd Fix all 9 spec test failures: Env scope chain, IO detection, offline mutation ...

- env.py: Add MergedEnv with dual-parent lookup (primary for set!,
  secondary for reads), add dict-compat methods to Env
- platform_py.py: make_lambda stores env reference (no copy), env_merge
  uses MergedEnv for proper set! propagation, ancestor detection prevents
  unbounded chains in TCO recursion, sf_set_bang walks scope chain
- types.py: Component/Island io_refs defaults to None (not computed)
  instead of empty set, so component-pure? falls through to scan
- run.py: Test env uses Env class, mock execute-action calls SX lambdas
  via _call_sx instead of direct Python call

Spec tests: 320/320 (was 311/320)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-03-11 09:42:04 +00:00

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