Omni/Agent/Subagent: fix per-spawn guardrails for Coder

The Coder subagent was ignoring per-spawn guardrails from
subagentGuardrails and always using SubagentConfig defaults.

Now uses getGuardrail helper to check SpawnGuardrails first,
falling back to SubagentConfig defaults if not specified.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

1 files changed, 7 insertions, 4 deletions

diff --git a/Omni/Agent/Subagent.hs b/Omni/Agent/Subagent.hs
index 597b361..3eeda3e 100644
--- a/Omni/Agent/Subagent.hs
+++ b/Omni/Agent/Subagent.hs
@@ -844,7 +844,10 @@ runCoderSubagentWrapper keys config callbacks = do
     else do
       onSubagentStart callbacks ("Starting Coder subagent for " <> namespace <> "...")
 
-      -- Build CoderConfig from SubagentConfig
+      -- Build CoderConfig from SubagentConfig, using per-spawn guardrails if provided
+      let getGuardrail field def = case subagentGuardrails config of
+            Just g -> fromMaybe def (field g)
+            Nothing -> def
       let coderCfg =
             Coder.CoderConfig
               { Coder.coderNamespace = namespace,
@@ -852,9 +855,9 @@ runCoderSubagentWrapper keys config callbacks = do
                 Coder.coderContext = subagentContext config,
                 Coder.coderModel = fromMaybe "anthropic/claude-sonnet-4" (subagentModel config),
                 Coder.coderTimeout = subagentTimeout config,
-                Coder.coderMaxCost = subagentMaxCost config,
-                Coder.coderMaxTokens = subagentMaxTokens config,
-                Coder.coderMaxIterations = subagentMaxIterations config,
+                Coder.coderMaxCost = getGuardrail spawnMaxCostCents (subagentMaxCost config),
+                Coder.coderMaxTokens = getGuardrail spawnMaxTokens (subagentMaxTokens config),
+                Coder.coderMaxIterations = getGuardrail spawnMaxIterations (subagentMaxIterations config),
                 Coder.coderMaxVerifyRetries = 3
               }