feat: add configurable reasoning effort to Coder agents (#26974)

coderd/database/dump.sql

@@ -350,6 +350,16 @@ CREATE TYPE chat_plan_mode AS ENUM (
     'plan'
 );
 
+CREATE TYPE chat_reasoning_effort AS ENUM (
+    'none',
+    'minimal',
+    'low',
+    'medium',
+    'high',
+    'xhigh',
+    'max'
+);
+
 CREATE TYPE chat_status AS ENUM (
     'waiting',
     'pending',
@@ -1938,9 +1948,12 @@ CREATE TABLE chat_messages (
     deleted boolean DEFAULT false NOT NULL,
     provider_response_id text,
     api_key_id text,
-    revision bigint NOT NULL
+    revision bigint NOT NULL,
+    reasoning_effort chat_reasoning_effort
 );
 
+COMMENT ON COLUMN chat_messages.reasoning_effort IS 'Stores the selected effort for the turn triggered by this message.';
+
 CREATE SEQUENCE chat_messages_id_seq
     START WITH 1
     INCREMENT BY 1
@@ -1986,9 +1999,12 @@ CREATE TABLE chat_queued_messages (
     model_config_id uuid,
     api_key_id text,
     "position" bigint DEFAULT nextval('chat_queued_messages_position_seq'::regclass) NOT NULL,
-    created_by uuid NOT NULL
+    created_by uuid NOT NULL,
+    reasoning_effort chat_reasoning_effort
 );
 
+COMMENT ON COLUMN chat_queued_messages.reasoning_effort IS 'Stores the selected effort until the queued row is promoted.';
+
 CREATE SEQUENCE chat_queued_messages_id_seq
     START WITH 1
     INCREMENT BY 1
@@ -2062,6 +2078,7 @@ CREATE TABLE chats (
     context_dirty_since timestamp with time zone,
     context_dirty_resources jsonb,
     context_error text DEFAULT ''::text NOT NULL,
+    last_reasoning_effort chat_reasoning_effort,
     CONSTRAINT chat_acl_only_on_root_chats CHECK ((((parent_chat_id IS NULL) AND (root_chat_id IS NULL)) OR ((user_acl = '{}'::jsonb) AND (group_acl = '{}'::jsonb)))),
     CONSTRAINT chat_group_acl_not_null_jsonb CHECK (((group_acl IS NOT NULL) AND (jsonb_typeof(group_acl) = 'object'::text))),
     CONSTRAINT chat_user_acl_not_null_jsonb CHECK (((user_acl IS NOT NULL) AND (jsonb_typeof(user_acl) = 'object'::text))),
@@ -2083,6 +2100,8 @@ COMMENT ON COLUMN chats.context_dirty_resources IS 'Deterministic prefix of reso
 
 COMMENT ON COLUMN chats.context_error IS 'Snapshot-level error copied from the pinned snapshot (count cap exceeded, watcher degraded, etc.). Empty when healthy.';
 
+COMMENT ON COLUMN chats.last_reasoning_effort IS 'Stores the most recent message effort once per-turn selection is wired.';
+
 CREATE TABLE users (
     id uuid NOT NULL,
     email text NOT NULL,
@@ -2148,6 +2167,7 @@ CREATE VIEW chats_expanded AS
     c.parent_chat_id,
     c.root_chat_id,
     c.last_model_config_id,
+    c.last_reasoning_effort,
     c.archived,
     c.last_error,
     c.mode,