fix(opencode): tests drop XDG_DATA_HOME, status reads the adapter's db, the version probe runs in a home of its own (Issue #60, review 2)

- Review 8a485fa0 B1 / c9d06e85 / c4e96018 (blocking): the adapter now
  follows the caller's XDG_DATA_HOME for its own home, but the tests did not
  drop it: a sandbox that sets HOME resolved the runner's real data dir.
  XDG_DATA_HOME joins _agent_home_guard.DROPPED_VARS (dropped per test), and
  the session guard watches <XDG_DATA_HOME>/opencode when it is set.
  Checked with XDG_DATA_HOME set to a separate dir: the opencode modules
  pass and nothing is written there.
- status.sh asks the adapter for the db (`debug paths`, XDG-aware) instead
  of a fixed ~/.local/share/opencode (8a485fa0 N1).
- The opt-in test's `opencode --version` probe ran with the real HOME at
  import and appended to the real opencode log; it runs in a temporary home
  now (8a485fa0 N2).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VCgu9Fa9iT7TbJUSzdq4Ff

.agents/skills/multi-agent-mux-status/scripts/status.sh

@@ -105,20 +105,10 @@ def resume_on_disk(s):
     if agent == 'opencode':
         u = s.get('opencode_session_id_own')
         if u:
-            base_dir = f"{home}/.local/share/opencode"
-            odb = None
-            for cand in [f"{base_dir}/opencode.db", f"{base_dir}/storage.db"]:
-                if os.path.exists(cand):
-                    odb = cand
-                    break
-            if not odb and os.path.isdir(f"{base_dir}/project"):
-                for root, _, files in os.walk(f"{base_dir}/project"):
-                    for f in files:
-                        if f.endswith(".db"):
-                            odb = os.path.join(root, f)
-                            break
-                    if odb:
-                        break
+            # the adapter's db: `opencode debug paths`, which follows XDG_DATA_HOME (Issue #60)
+            from lib_py.agents.registry import get_adapter
+            from lib_py.agents.base import DiscoveryContext
+            odb = get_adapter('opencode')._resolve_db(DiscoveryContext(workspace=cwd, agent_name='opencode', home_dir=home))
             if not odb or not os.path.exists(odb):
                 return 'MISSING'
             try:
@@ -315,20 +305,10 @@ def resume_on_disk(s):
     if agent == 'opencode':
         u = s.get('opencode_session_id_own')
         if u:
-            base_dir = f"{home}/.local/share/opencode"
-            odb = None
-            for cand in [f"{base_dir}/opencode.db", f"{base_dir}/storage.db"]:
-                if os.path.exists(cand):
-                    odb = cand
-                    break
-            if not odb and os.path.isdir(f"{base_dir}/project"):
-                for root, _, files in os.walk(f"{base_dir}/project"):
-                    for f in files:
-                        if f.endswith(".db"):
-                            odb = os.path.join(root, f)
-                            break
-                    if odb:
-                        break
+            # the adapter's db: `opencode debug paths`, which follows XDG_DATA_HOME (Issue #60)
+            from lib_py.agents.registry import get_adapter
+            from lib_py.agents.base import DiscoveryContext
+            odb = get_adapter('opencode')._resolve_db(DiscoveryContext(workspace=cwd, agent_name='opencode', home_dir=home))
             if not odb or not os.path.exists(odb):
                 return 'MISSING'
             try: