refactor(cli): extract 25 more subcommand parsers into hermes_cli/subcommands/

Batch extraction of every remaining subcommand whose handler is top-level and
whose parser block is pure argparse: model, setup, postinstall, whatsapp, slack,
login, logout, auth, status, webhook, hooks, doctor, security, dump, debug,
backup, import, config, version, update, uninstall, dashboard, gui, logs,
prompt-size.

Each becomes hermes_cli/subcommands/<name>.py with build_<name>_parser() and an
injected handler (no main import). dashboard also injects cmd_dashboard_register
for its nested 'register' action.

Behavior-neutral: all 25 subcommands' --help output (and nested subaction help)
diff-verified byte-identical to pre-extraction. Two RawDescriptionHelpFormatter
epilogs (debug, logs) needed their multi-line string interiors preserved at
column 0 — caught by the --help diff, not compile.

main() 3297 -> 1798 LOC across this PR; add_parser calls in main.py 179 -> 89.

Validation: tests/hermes_cli/ 6476 passed / 0 failed under per-file process
isolation; new test_subcommands_batch.py smoke-tests all 25 builders + the
dashboard two-handler case.

hermes_cli/subcommands/postinstall.py

@@ -0,0 +1,23 @@
+"""``hermes postinstall`` subcommand parser.
+
+Extracted verbatim from ``hermes_cli/main.py:main()`` (god-file Phase 2).
+Handler injected to avoid importing ``main``.
+"""
+
+from __future__ import annotations
+
+from typing import Callable
+
+
+def build_postinstall_parser(subparsers, *, cmd_postinstall: Callable) -> None:
+    """Attach the ``postinstall`` subcommand to ``subparsers``."""
+    # =========================================================================
+    # postinstall command
+    # =========================================================================
+    postinstall_parser = subparsers.add_parser(
+        "postinstall",
+        help="Bootstrap non-Python deps for pip installs (node, browser, ripgrep, ffmpeg)",
+        description="One-shot post-install for pip users. Installs system "
+        "dependencies that pip cannot provide, then runs setup if needed.",
+    )
+    postinstall_parser.set_defaults(func=cmd_postinstall)