goals: note TEMP_REFERENCE/expect-6.0a1 in G-020/G-044/G-061

Readonly reference checkout of the community Tcl 9 port of classic
Expect (alpha, Linux-tested, unix-pty only - no ConPTY/windows
backend). Full assessment in the G-061 notes: reference for expect
primitive semantics, candidate unix-backend tool at arm's length,
pty-allocation reference. G-020/G-044 get pointers, plus stale
"candidate goal drafted" phrasing updated to name G-061.

Assisted-by: harness=claude; primary-model=claude-fable-5; api-location=anthropic.com

goals/G-020-screencap-input-module.md

@@ -102,7 +102,12 @@ navigation - see the preserve-list in goals/G-044 detail) currently has no autom
 harness: the underlying editbuf is console-coupled and there is no expect-like system.
 This module is the practical near-term bridge on windows: inject keystrokes at a live
 punkshell window and capture/compare the rendered region. Coarser than a pseudoconsole
-expect-alternative (the durable successor - candidate goal drafted 2026-07-11) but
+expect-alternative (the durable successor - that candidate became G-061) but
 available sooner, and it can verify exactly the rendered-behaviour tier that unit tests
 cannot reach. Worth weighting this goal's priority accordingly when sequencing repl
 refactor work.
+
+Reference material (added 2026-07-21): `TEMP_REFERENCE/expect-6.0a1` (readonly) is
+the community Tcl 9 port of classic Expect - unix-pty only, no windows/ConPTY
+backend, so it does not displace this module's windows role; see the G-061 detail
+file's notes for the full assessment.

goals/G-044-repl-command-completion.md

@@ -125,4 +125,7 @@ Testability findings (spikes 2026-07-11):
   just a feature goal.
 - Interactive end-to-end verification tiers: G-020 (screencap+input injection) as the
   near-term windows-only harness; a pseudoconsole (ConPTY/pty) expect-alternative as
-  the durable cross-platform mechanism (candidate goal drafted 2026-07-11).
+  the durable cross-platform mechanism - that candidate became G-061. Reference
+  material for the latter (added 2026-07-21): `TEMP_REFERENCE/expect-6.0a1`
+  (readonly), the community Tcl 9 port of classic Expect (unix-pty only, no
+  ConPTY) - assessment recorded in the G-061 detail file's notes.

goals/G-061-pseudoconsole-expect.md

@@ -70,6 +70,20 @@ expect-like primitives over a REAL pseudo-terminal:
 
 ## Notes
 
+- Reference material (added 2026-07-21): `TEMP_REFERENCE/expect-6.0a1` is a readonly
+  checkout of the community Tcl 9 port of classic Expect (contributions from Steve
+  Shaw, Paul Obermeier, OpenMandriva, Ashok P. Nadkarni; per its README: builds on
+  Tcl 8.6 and 9.x, work-in-progress alpha, only Linux tested). It is unix-pty only -
+  it contains NO ConPTY/windows backend (the `_WIN32` occurrences are
+  autoconf/tcl.m4 boilerplate) - so it does not solve this goal's windows side.
+  Its value here: (a) the authoritative reference for expect primitive semantics
+  this harness mirrors - spawn/send/expect/interact, timeout and eof handling,
+  pattern matching over the pty byte stream (exp_command.c, exp_inter.c,
+  exp_event.c, exp_chan.c); (b) a concrete candidate for the "existing tool at
+  arm's length" option for the unix backend (see open implementation questions
+  above) - a Tcl 9-compatible expect proper may serve as the unix pty driver,
+  with the harness contract layered over it; (c) its pty allocation code
+  (pty_termios.c etc) as reference if we build our own openpty shim instead.
 - Related: [[G-044]] (completion/hinting - consumes this for its own verification),
   [[G-001]] (fake-console unit tier), [[G-020]] (screen-capture tier), [[G-059]] (WSL
   execution pattern), [[G-060]] (guest-driving contract - a pty harness inside a QEMU