fix: route case-insensitive worker messages

Assistant: codex
Assistant-Model: gpt-5.6-sol
Assistant-Session: 01a03397-4d51-7fd1-8ff2-946eb22ea2bc

workplans/ADHOC-2026-08-25.md

@@ -66,3 +66,27 @@ rather than a traceback.
 - Plain `make` lists `help`, `install`, `uninstall`, `test`, and `check` with
   descriptions. `make check` passes 136 tests and `make install` refreshes the
   installed `tmux-amq==0.1.0` tool.
+
+## Case-insensitive protocol and full-screen worker output
+
+```task
+id: TAMQ-WP-ADHOC-2026-08-25-T03
+status: done
+priority: high
+```
+
+Make the `To:`, `From:`, and `Cmd:` protocol keywords case-insensitive and
+restore agent-authored routing when a full-screen terminal interface renders
+worker content behind a presentation gutter.
+
+### Evidence
+
+- All four representative letter-case variants route for `To:` and parse for
+  `Cmd:`; delivered `From:` envelopes remain inert regardless of case. Plain
+  shell panes install matching harmless absorbers for every keyword variant.
+- Worker output accepts a conservative full-screen output gutter (including
+  Codex's `•`) but rejects operator, shell, and markup gutters such as `›`,
+  `>`, `$`, `#`, `*`, and `-`.
+- A real tmux/PTY integration fixture emits a cursor-positioned, mixed-case,
+  bullet-framed worker message. It is durably attributed as `worker_output`
+  while the operator echo is suppressed.