giles 2c61be39de tcl: Phase 6 coroutines + clock/file stubs + idiom corpus (+40 tests, 329 total) ...

- Coroutines (generator-style): coroutine/yield/yieldto commands; eager yield
  collection during body execution, pop-on-call dispatch via registered command
  closures; coro-yields + coroutines threaded through tcl-call-proc
- info exists varname (plus hostname/script/tclversion stubs)
- clock seconds/milliseconds/format/scan stubs
- File I/O stubs: open/close/read/eof/seek/tell/flush + file subcommands
- format command: full %-specifier parsing with flags, width, zero-pad, left-align
- Fixed dict set/unset/incr/append/update to use tcl-var-get (upvar alias aware)
- Fixed lappend and append to use tcl-var-get for reading (upvar alias aware)
- 20 coroutine tests (coro.sx) + 20 idiom corpus tests (idioms.sx)
- event-loop.tcl program: cooperative scheduler demo using coroutines
- Note: coroutines eagerly collect yields (generator-style, not true suspension)

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

2026-05-06 11:05:28 +00:00

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