chore(ai-tooling): standardize agent model policy

.codex/agents/browser-check.toml

@@ -1,4 +1,4 @@
-model = "gpt-5.3-codex-spark"
+model = "gpt-5.4"
 model_reasoning_effort = "medium"
 sandbox_mode = "read-only"
 developer_instructions = """

.codex/agents/code-quality.toml

@@ -1,4 +1,4 @@
-model = "gpt-5.3-codex"
+model = "gpt-5.4"
 model_reasoning_effort = "medium"
 developer_instructions = """
 Run the repo's required verification commands for the files or feature area the parent agent just changed, then fix only issues surfaced by those checks.

.codex/agents/plan-implementer.toml

@@ -1,4 +1,4 @@
-model = "gpt-5.3-codex"
+model = "gpt-5.4"
 model_reasoning_effort = "medium"
 developer_instructions = """
 Implement only the concrete task or task slice assigned by the parent agent.

.codex/agents/profiler.toml

@@ -1,4 +1,4 @@
-model = "gpt-5.3-codex-spark"
+model = "gpt-5.4"
 model_reasoning_effort = "medium"
 sandbox_mode = "read-only"
 developer_instructions = """

.codex/agents/react-doctor-fixer.toml

@@ -1,4 +1,4 @@
-model = "gpt-5.3-codex"
+model = "gpt-5.4"
 model_reasoning_effort = "medium"
 developer_instructions = """
 Only act when the parent agent provides both the exact React Doctor diagnostic and a concrete fix plan.

.codex/agents/react-patterns-enforcer.toml

@@ -1,4 +1,4 @@
-model = "gpt-5.3-codex"
+model = "gpt-5.4"
 model_reasoning_effort = "medium"
 developer_instructions = """
 Review only the recently changed React files or the file set the parent agent names.

.codex/agents/test-apk.toml

@@ -1,4 +1,4 @@
-model = "gpt-5.3-codex"
+model = "gpt-5.4"
 model_reasoning_effort = "medium"
 developer_instructions = """
 Test only the Android workflow the parent agent asks about on the local emulator, leaving the emulator running when you finish unless the parent agent says otherwise.

.codex/agents/translator.toml

@@ -1,4 +1,4 @@
-model = "gpt-5.3-codex-spark"
+model = "gpt-5.4"
 model_reasoning_effort = "medium"
 developer_instructions = """
 Translate exactly one i18next key at a time into every supported language.