feat(cli): make hermes serve a real headless backend

`serve` (added in #54568) reused cmd_dashboard wholesale, so it still
behaved like a dashboard: it ran a full vite build every launch, mounted
and served the SPA whenever a stray web_dist/ existed, printed
"Hermes Web UI →", and announced HERMES_DASHBOARD_READY. It's the headless
JSON-RPC/WS backend the desktop app and remote clients run — pure socket
clients that never load the browser SPA.

Mark serve with headless_backend=True (resolved once in cmd_dashboard) and:

- skip _build_web_ui entirely on the serve path
- export HERMES_SERVE_HEADLESS=1 so mount_spa() disables the SPA even when a
  dist is present — only the JSON-RPC/WS/API surface is reachable
- announce the bind ("Hermes backend listening on host:port") instead of a
  browser/auth-gated URL
- print a neutral HERMES_BACKEND_READY sentinel; dashboard keeps the legacy
  one and the desktop port-discovery regex matches either
- preserve serve across the named-profile re-exec so it can't rebuild as
  dashboard

`hermes dashboard` is unchanged (builds + serves the browser UI). Backward
compatible: old apps only ever spawn dashboard (legacy token + UI intact)
and never invoke serve; the ready-file side channel is name-agnostic. The
one behavior change is that a remote `hermes serve` no longer serves the
browser dashboard as a side effect — that's `hermes dashboard`'s job.

Tests: serve headless_backend contract, SPA-disabled-with-dist, the
HERMES_BACKEND_READY desktop parse (17/17 node), and the existing
serve/dashboard/web_server suites. AGENTS.md documents the behavior.
This commit is contained in:
Brooklyn Nicholson 2026-06-30 17:58:47 -05:00
parent 812236bff8
commit f0f8c84d1b
8 changed files with 93 additions and 16 deletions

View file

@ -61,3 +61,10 @@ def test_serve_takes_the_same_runtime_flags_as_dashboard():
def test_serve_supports_the_lifecycle_flags():
for flag in ("--stop", "--status"):
assert getattr(_parser().parse_args(["serve", flag]), flag.lstrip("-")) is True
def test_serve_is_a_headless_backend_but_dashboard_is_not():
# `headless_backend` is the flag cmd_dashboard reads to skip the web UI
# build; only `serve` carries it.
assert getattr(_parser().parse_args(["serve"]), "headless_backend", False) is True
assert getattr(_parser().parse_args(["dashboard"]), "headless_backend", False) is False