fix: patch skills module-level caches on per-request profile switch

Per-request profile switches (process_wide=False, introduced in #1700)
update os.environ['HERMES_HOME'] but skip _set_hermes_home(), which is
responsible for monkeypatching module-level caches.

Both tools/skills_tool.py and tools/skill_manager_tool.py set
HERMES_HOME and SKILLS_DIR once at import time. When a non-default
profile is active in the WebUI, os.environ['HERMES_HOME'] is correctly
updated per-turn in the _ENV_LOCK block, but the module-level
constants still point at the root profile. All agent-side skill
operations — skills_list(), skill_view(), skill_manage() — read and
write to the wrong directory.

Add the same monkeypatching that _set_hermes_home() already performs
(profiles.py line ~620) to the per-turn env setup block in
streaming.py, covering both skills_tool and skill_manager_tool.

The WebUI display half was already fixed in #1917 via
_active_skills_dir() in routes.py. This patch fixes the agent-side
half so the running agent resolves skills from the correct profile.

api/streaming.py

@@ -2046,6 +2046,23 @@ def _run_agent_streaming(
             os.environ['HERMES_SESSION_KEY'] = session_id
             if _profile_home:
                 os.environ['HERMES_HOME'] = _profile_home
+                # Patch module-level caches to match the active profile.
+                # _set_hermes_home() does this for process-wide switches
+                # but per-request switches skip it (#1700).
+                from pathlib import Path as _P
+                _ph = _P(_profile_home)
+                try:
+                    import tools.skills_tool as _sk
+                    _sk.HERMES_HOME = _ph
+                    _sk.SKILLS_DIR = _ph / 'skills'
+                except (ImportError, AttributeError):
+                    pass
+                try:
+                    import tools.skill_manager_tool as _sm
+                    _sm.HERMES_HOME = _ph
+                    _sm.SKILLS_DIR = _ph / 'skills'
+                except (ImportError, AttributeError):
+                    pass
         # Lock released — agent runs without holding it
         # ── MCP Server Discovery (lazy import, idempotent) ──
         # MUST run AFTER the HERMES_HOME mutation above — `discover_mcp_tools()`