revert(cron): remove per-job profile support (PR #28124) (#43956)

Fully removes the cron per-job 'profile' arg added in #28124: the
cronjob tool schema field, CLI --profile flags on cron create/edit,
job-record storage/validation, the scheduler's _job_profile_context
wrapper, and the script-runner env override. Sequential-partition
logic reverts to workdir-only.

The context-local HERMES_HOME override in hermes_constants and the
subprocess bridging in tools/environments/local.py are kept — they
now have other consumers (dashboard multi-profile, TUI gateway).

hermes_cli/cron.py

@@ -120,9 +120,6 @@ def cron_list(show_all: bool = False):
         workdir = job.get("workdir")
         if workdir:
             print(f"    Workdir:   {workdir}")
-        profile = job.get("profile")
-        if profile:
-            print(f"    Profile:   {profile}")
 
         # Execution history
         last_status = job.get("last_status")
@@ -221,7 +218,6 @@ def cron_create(args):
         skills=_normalize_skills(getattr(args, "skill", None), getattr(args, "skills", None)),
         script=getattr(args, "script", None),
         workdir=getattr(args, "workdir", None),
-        profile=getattr(args, "profile", None),
         no_agent=getattr(args, "no_agent", False) or None,
     )
     if not result.get("success"):
@@ -239,8 +235,6 @@ def cron_create(args):
         print("  Mode: no-agent (script stdout delivered directly)")
     if job_data.get("workdir"):
         print(f"  Workdir: {job_data['workdir']}")
-    if job_data.get("profile"):
-        print(f"  Profile: {job_data['profile']}")
     print(f"  Next run: {result['next_run_at']}")
     return 0
 
@@ -286,7 +280,6 @@ def cron_edit(args):
         skills=final_skills,
         script=getattr(args, "script", None),
         workdir=getattr(args, "workdir", None),
-        profile=getattr(args, "profile", None),
         no_agent=getattr(args, "no_agent", None),
     )
     if not result.get("success"):
@@ -307,8 +300,6 @@ def cron_edit(args):
         print("  Mode: no-agent (script stdout delivered directly)")
     if updated.get("workdir"):
         print(f"  Workdir: {updated['workdir']}")
-    if updated.get("profile"):
-        print(f"  Profile: {updated['profile']}")
     return 0