briefs/2.2.0-remaining-issues: record myield_from completion

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: Technologicat

briefs/2.2.0-remaining-issues.md

@@ -31,19 +31,24 @@ ordering is preserved below; status flags mark what's done.
    which lets us align with the stdlib idiom now without breaking 2.x
    callers — #102 retained as the 3.0.0 "drop the `TypeError` base"
    tracker.
-5. ~~**#80**~~ — **done** this session. `@multishot`/`myield` macros
-   and `MultishotIterator` adapter shipped in
-   `unpythonic.syntax.multishot`. Promoted from the `test_conts_multishot.py`
-   proof-of-concept, with the multi-phase scaffolding dropped and the
-   adapter extended to v1 surface (gi_frame always None, gi_code as the
-   liveness signal, gi_running always False, gi_yieldfrom None,
-   `__copy__` shallow fork, `__deepcopy__` raises TypeError, `__del__`
-   calls `close`). Brief: `briefs/multishot-implementation.md`.
-   Tests: `unpythonic/syntax/tests/test_multishot.py` (45 passing).
-   Doc: new "Multi-shot generators with `@multishot` and `myield`"
-   subsection in `doc/macros.md`. Issue closed. **`myield_from`
-   follow-up** flagged in the brief as the immediate post-v1 changeset
-   while CI engines are still warm.
+5. ~~**#80**~~ — **done** across two slots. v1 (`@multishot`, `myield`,
+   `MultishotIterator`) shipped earlier this session; `myield_from`
+   follow-up landed in `839953b`. Final v1 surface: `gi_frame` always
+   None, `gi_code` as the liveness signal, `gi_running` always False,
+   `gi_yieldfrom` tracks the inner iterator while delegating, `__copy__`
+   shallow fork, `__deepcopy__` raises TypeError, `__del__` calls
+   `close`. `myield_from` architecture: let/cc-style rest-of-outer
+   capture (`_rest = call_cc[get_cc()]`) + tail-called driver +
+   cut-the-tail `_yieldf` to escape each `(captured_cc, value)` to the
+   user's trampoline. Bonus refactor (commit `839953b`): shared
+   `_step(k, mode, value)` helper + send-to-bare-myield bug fix +
+   `throw` capture-and-update. Misplaced `myield_from` raises
+   `SyntaxError` symmetrically with `myield`. Brief:
+   `briefs/multishot-implementation.md`. Tests:
+   `unpythonic/syntax/tests/test_multishot.py` (72 passing).
+   Doc: "Multi-shot generators with `@multishot` and `myield`" +
+   "Delegating to another multi-shot: `myield_from`" subsections in
+   `doc/macros.md`. Issue closed.
 6. **#83** — pending; `end_lineno` / `end_col_offset` sweep, last.
 
 Only **#83** remains for 2.2.0. It's explicitly *do last* — cross-cutting,