giles d295ab8463 tcl: Phase 4 error handling — catch/try/throw/return-code (+39 tests, 267 total) ...

Implements catch, throw, try, return -code options, and error with
errorinfo/errorcode fields. catch runs sub-script isolated, captures
result and exit code (0-4); try dispatches on/finally clauses;
throw sets code 1 with errorcode; return -code parses flag options.

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

2026-05-06 09:58:32 +00:00

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