feat: add configuration for model, mode, and thought level (#205)

* feat: add configuration for model, mode, and thought level

* docs: document Claude effort-level filesystem config

* fix: prevent panic on empty modes/thoughtLevels in parse_agent_config

Use `.first()` with safe fallback instead of direct `[0]` index access,
which would panic if the Vec is empty and no default is set.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: harden session lifecycle and align cli.mdx example with claude.json

- destroySession: wrap session/cancel RPC in try/catch so local cleanup
  always succeeds even when the agent is unreachable
- createSession/resumeOrCreateSession: clean up the remote session if
  post-creation config calls (setMode/setModel/setThoughtLevel) fail,
  preventing leaked orphan sessions
- cli.mdx: fix example output to match current claude.json (model name,
  model order, and populated modes)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: harden session lifecycle and align config persistence logic

- resumeOrCreateSession: Remove destroy-on-error for the resume path. Config
  errors now propagate without destroying a pre-existing session. The destroy
  pattern remains in createSession (where the session is newly created and has
  no prior state to preserve).

- setSessionMode fallback: When session/set_mode returns -32601 and the
  fallback uses session/set_config_option, now keep modes.currentModeId
  in sync with the updated currentValue. Prevents stale cached state in
  getModes() when the fallback path is used.

- persistSessionStateFromMethod: Re-read the record from persistence instead
  of using a stale pre-await snapshot. Prevents race conditions where
  concurrent session/update events (processed by persistSessionStateFromEvent)
  are silently overwritten by optimistic updates.

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

* fix: correct doc examples with valid Codex modes and update stable API list

- Replace invalid Codex mode values ("plan", "build") with valid ones
  ("auto", "full-access") in agent-sessions.mdx and sdk-overview.mdx
- Update CLAUDE.md stable method enumerations to include new session
  config methods (setSessionMode, setSessionModel, etc.)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: add OpenAPI annotations for process endpoints and fix config persistence race

Add summary/description to all process management endpoint specs and the
not_found error type. Fix hydrateSessionConfigOptions to re-read from
persistence after the network call, and sync mode-category configOptions
on session/update current_mode_update events.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

docs/agent-sessions.mdx

@@ -82,6 +82,49 @@ if (sessions.items.length > 0) {
 }
 ```
 
+## Configure model, mode, and thought level
+
+Set the model, mode, or thought level on a session at creation time or after:
+
+```ts
+// At creation time
+const session = await sdk.createSession({
+  agent: "codex",
+  model: "gpt-5.3-codex",
+  mode: "auto",
+  thoughtLevel: "high",
+});
+```
+
+```ts
+// After creation
+await session.setModel("gpt-5.2-codex");
+await session.setMode("full-access");
+await session.setThoughtLevel("medium");
+```
+
+Query available modes:
+
+```ts
+const modes = await session.getModes();
+console.log(modes?.currentModeId, modes?.availableModes);
+```
+
+### Advanced config options
+
+For config options beyond model, mode, and thought level, use `getConfigOptions` to discover what the agent supports and `setConfigOption` to set any option by ID:
+
+```ts
+const options = await session.getConfigOptions();
+for (const opt of options) {
+  console.log(opt.id, opt.category, opt.type);
+}
+```
+
+```ts
+await session.setConfigOption("some-agent-option", "value");
+```
+
 ## Destroy a session
 
 ```ts