opentui(phase3): launcher integration — HERMES_TUI_ENGINE dual-engine

hermes --tui launches the native OpenTUI engine (Bun) when
HERMES_TUI_ENGINE=opentui (env) or display.tui_engine=opentui (config);
Ink stays the default and the shipping path is untouched.

- _resolve_tui_engine() (env > config > ink); refuses opentui on
  Windows/Termux (no Bun) -> falls back to ink with a notice.
- _make_opentui_argv() -> [bun, src/entry.real.tsx] (no build step).
- _bun_bin() with HERMES_BUN override.
- Branch at top of _make_tui_argv BEFORE _ensure_tui_node (Bun-only host
  must not bootstrap Node).
- Gate _launch_tui NODE_OPTIONS/--max-old-space-size on engine==ink (Bun
  is JSC; the V8 flag errors/ignores).

Verified end-to-end via tmux: real hermes --tui -> Bun -> OpenTUI ->
real Python gateway streamed a real reply. No-flag default still ink.

Dockerfile

@@ -25,7 +25,7 @@ ENV PLAYWRIGHT_BROWSERS_PATH=/opt/hermes/.playwright
 # hermes process, the dashboard, and per-profile gateways.
 RUN apt-get update && \
     apt-get install -y --no-install-recommends \
-    ca-certificates curl iputils-ping python3 python-is-python3 ripgrep ffmpeg gcc g++ make cmake python3-dev python3-venv libffi-dev libolm-dev procps git openssh-client docker-cli xz-utils && \
+    ca-certificates curl iputils-ping python3 python-is-python3 ripgrep ffmpeg gcc python3-dev python3-venv libffi-dev libolm-dev procps git openssh-client docker-cli xz-utils && \
     rm -rf /var/lib/apt/lists/*
 
 # ---------- s6-overlay install ----------
@@ -146,9 +146,9 @@ RUN npm install --prefer-offline --no-audit && \
 #
 # `uv sync --frozen --no-install-project --extra all --extra messaging`
 # installs the deps reachable through the composite `[all]` extra
-# (handpicked set intended for the production image — excludes `[dev]`),
-# plus gateway messaging adapters that should work in the published image
-# without a first-boot lazy install.  We do NOT use `--all-extras`:
+# (handpicked set intended for the production image), plus gateway
+# messaging adapters that should work in the published image without a
+# first-boot lazy install.  We do NOT use `--all-extras`:
 # that would pull in `[rl]` (atroposlib + tinker + torch + wandb from
 # git), `[yc-bench]` (another git dep), and `[termux-all]` (Android
 # redundancy), none of which belong in the published container.
@@ -164,30 +164,19 @@ RUN npm install --prefer-offline --no-audit && \
 # image update and recall/retain then fails with
 # `ModuleNotFoundError: No module named 'hindsight_client'` (#38128).
 #
-# The Matrix gateway's deps ([matrix] extra) are baked in because
-# python-olm (transitive via mautrix[encryption]) builds from source on
-# Python/image combinations without usable wheels.  The Docker image is
-# Linux-only, so keeping the native libolm/build-toolchain packages here
-# avoids the cross-platform failures that kept [matrix] out of [all]
-# while still making Matrix work in the published container. Fixes #30399.
-#
 # The editable link is created after the source copy below.
 COPY pyproject.toml uv.lock ./
 RUN touch ./README.md
-RUN uv sync --frozen --no-install-project --extra all --extra messaging --extra anthropic --extra bedrock --extra azure-identity --extra hindsight --extra matrix
-
-# ---------- Frontend build (cached independently from Python source) ----------
-# Copy only the frontend source trees first so that Python-only changes don't
-# invalidate the (relatively slow) web + ui-tui build layer.
-COPY web/ web/
-COPY ui-tui/ ui-tui/
-RUN cd web && npm run build && \
-    cd ../ui-tui && npm run build
+RUN uv sync --frozen --no-install-project --extra all --extra messaging --extra anthropic --extra bedrock --extra azure-identity --extra hindsight
 
 # ---------- Source code ----------
 # .dockerignore excludes node_modules, so the installs above survive.
 COPY --chown=hermes:hermes . .
 
+# Build browser dashboard and terminal UI assets.
+RUN cd web && npm run build && \
+    cd ../ui-tui && npm run build
+
 # ---------- Permissions ----------
 # Make install dir world-readable so any HERMES_UID can read it at runtime.
 # The venv needs to be traversable too.