giles 7b72c064c4 HS: behavior cluster — install + element's subscript fix (+2 tests) ...

- install BehaviorName: parse-set-cmd handles `element` separately so
  `element's foo` after `set` invokes parse-poss rather than parse-expr,
  fixing `set element's bar["count"] to X` inside behavior bodies
- parse-poss-tail ident case: call parse-poss (handles `[`) instead of
  parse-prop-chain (does not) when next token is bracket-open
- hs-activate!: replace (handler el) with host-call-fn safe wrapper so
  native OCaml "Undefined symbol" throws (which bypass SX guard frames)
  are caught at the JS api_call_fn boundary rather than propagating

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

2026-05-05 03:57:10 +00:00

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