#661 exit-code foundation: @cli resolve_exit + error() auto-trip (inert) + @seedgo output_routing checker + devpulse reference adoption

- @cli: process failure-flag + resolve_exit(handled)->0/1/2; error() auto-trips the flag; inert until a branch adopts it; 10 tests, seedgo 100%
- @seedgo: new output_routing standard (39th checker) flags user-facing status output bypassing cli helpers; 254-site per-branch migration checklist; precise (0 FP, dogfooded on devpulse); 1178 tests
- devpulse: first adopter — main()->reset_command_state()+resolve_exit(); feedback module+handlers migrated raw-red/logger.error->error(); exit 2/0/1 verified; 380 tests green; seedgo 100%
- CHANGELOG updated. Fleet migration (remaining 13 branches) to follow. Tracked in DPLAN-0236.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HeaAmr3oj2ZexB6ng311Vj

src/aipass/cli/apps/modules/display.py

@@ -48,6 +48,36 @@ err_console = Console(stderr=True, force_terminal=sys.stderr.isatty())  # Stderr
 _TRIGGER = None
 _TRIGGER_LOADED = False
 
+# Process-level command failure flag — mutable container avoids global statement
+_CMD_STATE = {"failed": False}
+
+
+def mark_command_failed() -> None:
+    """Set the process-level failure flag (called automatically by error())."""
+    _CMD_STATE["failed"] = True
+
+
+def command_failed() -> bool:
+    """Return whether mark_command_failed() has been called since last reset."""
+    return _CMD_STATE["failed"]
+
+
+def reset_command_state() -> None:
+    """Reset the failure flag to False (for tests and main() entry)."""
+    _CMD_STATE["failed"] = False
+
+
+def resolve_exit(handled: bool) -> int:
+    """Map handled/failed state to an exit code.
+
+    Returns 1 if not handled, 2 if handled but failed, 0 otherwise.
+    """
+    if not handled:
+        return 1
+    if _CMD_STATE["failed"]:
+        return 2
+    return 0
+
 
 # ============================================================================
 # MODULE PATTERN FUNCTIONS (SEEDGO compliant)
@@ -341,6 +371,7 @@ def error(message: str, suggestion: str | None = None) -> None:
     Example:
         error('Branch not found', suggestion='Check branch name spelling')
     """
+    mark_command_failed()
     err_console.print(f"❌ [red bold]{message}[/red bold]")
     if suggestion:
         err_console.print(f"   [yellow]→ Try: {suggestion}[/yellow]")
@@ -411,6 +442,10 @@ __all__ = [
     "warning",
     "fatal",
     "section",
+    "mark_command_failed",
+    "command_failed",
+    "reset_command_state",
+    "resolve_exit",
 ]
 
 # ============================================================================