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.

hermes_cli/subcommands/cron.py

@@ -70,6 +70,10 @@ def build_cron_parser(subparsers, *, cmd_cron: Callable) -> None:
         "--workdir",
         help="Absolute path for the job to run from. Injects AGENTS.md / CLAUDE.md / .cursorrules from that directory and uses it as the cwd for terminal/file/code_exec tools. Omit to preserve old behaviour (no project context files).",
     )
+    cron_create.add_argument(
+        "--profile",
+        help="Hermes profile name to run the job under. Use 'default' for the root profile. Named profiles must already exist. Omit to preserve the scheduler's existing profile.",
+    )
 
     # cron edit
     cron_edit = cron_subparsers.add_parser(
@@ -134,6 +138,10 @@ def build_cron_parser(subparsers, *, cmd_cron: Callable) -> None:
         "--workdir",
         help="Absolute path for the job to run from (injects AGENTS.md etc. and sets terminal cwd). Pass empty string to clear.",
     )
+    cron_edit.add_argument(
+        "--profile",
+        help="Hermes profile name to run the job under. Use 'default' for the root profile. Pass empty string to clear.",
+    )
 
     # lifecycle actions
     cron_pause = cron_subparsers.add_parser("pause", help="Pause a scheduled job")