fix(codex): update bundled defaults to GPT 5.5 (#2132)

.codex/AGENTS.md

@@ -6,10 +6,10 @@ This supplements the root `AGENTS.md` with Codex-specific guidance.
 
 | Task Type | Recommended Model |
 |-----------|------------------|
-| Routine coding, tests, formatting | GPT 5.4 |
-| Complex features, architecture | GPT 5.4 |
-| Debugging, refactoring | GPT 5.4 |
-| Security review | GPT 5.4 |
+| Routine coding, tests, formatting | GPT 5.5 |
+| Complex features, architecture | GPT 5.5 |
+| Debugging, refactoring | GPT 5.5 |
+| Security review | GPT 5.5 |
 
 ## Skills Discovery
 

.codex/agents/docs-researcher.toml

@@ -1,4 +1,4 @@
-model = "gpt-5.4"
+model = "gpt-5.5"
 model_reasoning_effort = "medium"
 sandbox_mode = "read-only"
 
@@ -6,4 +6,4 @@ developer_instructions = """
 Verify APIs, framework behavior, and release-note claims against primary documentation before changes land.
 Cite the exact docs or file paths that support each claim.
 Do not invent undocumented behavior.
-"""
+"""

.codex/agents/explorer.toml

@@ -1,4 +1,4 @@
-model = "gpt-5.4"
+model = "gpt-5.5"
 model_reasoning_effort = "medium"
 sandbox_mode = "read-only"
 
@@ -6,4 +6,4 @@ developer_instructions = """
 Stay in exploration mode.
 Trace the real execution path, cite files and symbols, and avoid proposing fixes unless the parent agent asks for them.
 Prefer targeted search and file reads over broad scans.
-"""
+"""

.codex/agents/reviewer.toml

@@ -1,4 +1,4 @@
-model = "gpt-5.4"
+model = "gpt-5.5"
 model_reasoning_effort = "high"
 sandbox_mode = "read-only"
 
@@ -6,4 +6,4 @@ developer_instructions = """
 Review like an owner.
 Prioritize correctness, security, behavioral regressions, and missing tests.
 Lead with concrete findings and avoid style-only feedback unless it hides a real bug.
-"""
+"""