upgrade Claude to Opus 4.6 with effort levels (#256)

* upgrade Claude to Opus 4.6 with --effort max for --max mode

- mini: haiku → sonnet
- auto: opusplan → opus (Opus 4.6)
- max: opus → opus + --effort max (Opus 4.6 max effort)
- bump @anthropic-ai/claude-agent-sdk 0.2.7 → 0.2.39

Co-authored-by: Cursor <cursoragent@cursor.com>

* update action lockfile for claude-agent-sdk 0.2.39

Co-authored-by: Cursor <cursoragent@cursor.com>

* add tool_use_summary handler for SDK 0.2.39

Co-authored-by: Cursor <cursoragent@cursor.com>

* integrate gpt-5.3-codex with runtime model availability detection

checks GET /v1/models at agent start to determine if gpt-5.3-codex is
available for the API key, falling back to gpt-5.2-codex when it isn't.
model resolution runs concurrently with CLI install for zero added latency.
also bumps @openai/codex-sdk from 0.80.0 to 0.98.0.

Co-authored-by: Cursor <cursoragent@cursor.com>

---------

Co-authored-by: Cursor <cursoragent@cursor.com>

package.json

@@ -25,13 +25,13 @@
   },
   "dependencies": {
     "@actions/core": "^1.11.1",
-    "@anthropic-ai/claude-agent-sdk": "0.2.7",
+    "@anthropic-ai/claude-agent-sdk": "0.2.39",
     "@ark/fs": "0.53.0",
     "@ark/util": "0.53.0",
     "@octokit/plugin-throttling": "^11.0.3",
     "@octokit/rest": "^22.0.0",
     "@octokit/webhooks-types": "^7.6.1",
-    "@openai/codex-sdk": "0.80.0",
+    "@openai/codex-sdk": "0.98.0",
     "@opencode-ai/sdk": "^1.0.143",
     "@standard-schema/spec": "1.0.0",
     "@toon-format/toon": "^1.0.0",