fix(hooks): apply fail-forward to all command hooks

complexity-check and session-init now approve/continue on input errors
instead of exiting with error code. Follows ADR-002 fail-forward principle.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: rand

cmd/complexity-check/main.go

@@ -14,7 +14,9 @@ func main() {
 	input, err := hookio.ReadInput()
 	if err != nil {
 		hookio.Debug("Failed to read input: %v", err)
-		os.Exit(1)
+		// Fail forward - approve and continue rather than blocking
+		hookio.Approve("")
+		return
 	}
 
 	if os.Getenv("RLM_DISABLED") == "1" {

cmd/session-init/main.go

@@ -17,7 +17,9 @@ func main() {
 	input, err := hookio.ReadInput()
 	if err != nil {
 		hookio.Debug("Failed to read input: %v", err)
-		os.Exit(1)
+		// Fail forward - provide minimal context rather than blocking
+		hookio.SessionContext("RLM: input parse error, continuing with defaults")
+		return
 	}
 
 	hookio.Debug("Session start: source=%s, cwd=%s", input.Source, input.CWD)