fix(opencode): debug paths runs once per binary and home in a process (Issue #60, Linux item 6)

Every run appends a line to opencode's log, and one discover resolved the
database once per candidate. A successful answer is kept per (binary, HOME,
XDG_DATA_HOME) - the values the run sees; a failed run is not remembered.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.agents/skills/lib_py/agents/adapters/opencode.py

@@ -19,6 +19,9 @@ def _ro_connect(db: str):
     return sqlite3.connect(f"file:{quote(path)}?mode=ro" + ("" if both else "&immutable=1"), uri=True)
 
 
+# (binary, HOME, XDG_DATA_HOME) -> the db `debug paths` printed for them.
+_DB_PATHS = {}
+
 _PROVIDER_ENV_VARS = (
     'ANTHROPIC_API_KEY',
     'OPENAI_API_KEY',
@@ -126,13 +129,23 @@ class OpenCodeAgentAdapter(BaseAgentAdapter):
     def _resolve_db(self, ctx: DiscoveryContext) -> Optional[str]:
         # opencode 2.x prints its paths with `debug paths` (the 1.x `db path`
         # is gone: it prints the help and exits 0). Fallback: the default.
+        # Each run writes a line to opencode's log, so a process asks once
+        # per (binary, HOME, XDG_DATA_HOME) the run would see (Issue #60).
+        bin_path = self._bin(ctx)
+        if ctx.home_dir:
+            key = (bin_path, ctx.home_dir, self._data_home(ctx))
+        else:
+            key = (bin_path, os.environ.get("HOME"), os.environ.get("XDG_DATA_HOME"))
+        if bin_path and key in _DB_PATHS:
+            return _DB_PATHS[key]
         try:
             res = self._run(ctx, ["debug", "paths"], timeout=5)
             if res is not None and res.returncode == 0:
                 for line in res.stdout.splitlines():
                     parts = line.split(None, 1)
                     if len(parts) == 2 and parts[0] == "db":
-                        return parts[1].strip()
+                        _DB_PATHS[key] = parts[1].strip()
+                        return _DB_PATHS[key]
         except Exception:
             pass
         return os.path.join(self._data_home(ctx), "opencode", "opencode.db")