feat(profiles): --no-skills flag for empty profile creation (#20986)

Adds `hermes profile create <name> --no-skills` to create a profile with
zero bundled skills. Writes a `.no-bundled-skills` marker file in the
profile root so `hermes update`'s all-profile skill sync loop also skips
the profile — without the marker, every update would re-seed skills and
the user would have to delete them again.

Use case (from @hiut1u): orchestrator profiles and narrow-task profiles
don't need 100+ bundled skills polluting their system prompt.

- create_profile() gains a `no_skills` param, mutually exclusive with
  `--clone` / `--clone-all` (cloning explicitly copies skills).
- seed_profile_skills() no-ops on opted-out profiles and returns
  `{skipped_opt_out: True}` so callers can report cleanly.
- Web API (POST /api/profiles) accepts `no_skills: bool`.
- Delete `.no-bundled-skills` to opt back in — next `hermes update`
  re-seeds normally.

6 new tests in TestNoSkillsOptOut cover marker write, mutual exclusion
with clone, seed_profile_skills opt-out, fresh profile unaffected, and
delete-marker-re-enables-seeding.

hermes_cli/web_server.py

@@ -2366,6 +2366,7 @@ async def delete_cron_job(job_id: str):
 class ProfileCreate(BaseModel):
     name: str
     clone_from_default: bool = False
+    no_skills: bool = False
 
 
 class ProfileRename(BaseModel):
@@ -2471,11 +2472,13 @@ async def create_profile_endpoint(body: ProfileCreate):
             name=body.name,
             clone_from="default" if body.clone_from_default else None,
             clone_config=body.clone_from_default,
+            no_skills=body.no_skills,
         )
         # Match the CLI's profile-create flow: fresh named profiles get the
         # bundled skills installed. When cloning from default, create_profile()
         # has already copied the source profile's skills, including any
-        # user-installed skills.
+        # user-installed skills. When no_skills=True, create_profile() wrote
+        # the opt-out marker and seed_profile_skills() will no-op.
         if not body.clone_from_default:
             profiles_mod.seed_profile_skills(path, quiet=True)