feat(config): add team_mode schema (D-25 bounds, OFF by default)

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

.sisyphus/evidence/team-mode/task-1-default-parse.txt

@@ -0,0 +1,6 @@
+bun test v1.3.12 (700fc117)
+
+ 2 pass
+ 0 fail
+ 2 expect() calls
+Ran 2 tests across 1 file. [136.00ms]

.sisyphus/evidence/team-mode/task-1-invalid-bounds.txt

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+bun test v1.3.12 (700fc117)
+
+ 1 pass
+ 1 filtered out
+ 0 fail
+ 1 expect() calls
+Ran 1 test across 1 file. [48.00ms]

src/config/schema/team-mode.test.ts

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+/// <reference types="bun-types" />
+
+import { describe, expect, test } from "bun:test"
+
+import { TeamModeConfigSchema } from "./team-mode"
+
+describe("TeamModeConfigSchema", () => {
+  describe("#given all fields are omitted", () => {
+    test("#when parsed #then it returns the default team mode config", () => {
+      // given
+      const input = {}
+
+      // when
+      const result = TeamModeConfigSchema.parse(input)
+
+      // then
+      expect(result).toEqual({
+        enabled: false,
+        tmux_visualization: false,
+        max_parallel_members: 4,
+        max_members: 8,
+        max_messages_per_run: 10000,
+        max_wall_clock_minutes: 120,
+        max_member_turns: 500,
+        base_dir: undefined,
+        member_delegate_task_budget: 0,
+        message_payload_max_bytes: 32768,
+        recipient_unread_max_bytes: 262144,
+        mailbox_poll_interval_ms: 3000,
+      })
+    })
+  })
+
+  describe("#given invalid bounds are provided", () => {
+    test("#when parsed #then it rejects out of range values", () => {
+      // given
+      const invalidInputs = [
+        { max_parallel_members: -1 },
+        { max_members: 9 },
+        { message_payload_max_bytes: 512 },
+      ]
+
+      // when
+      const results = invalidInputs.map((input) => TeamModeConfigSchema.safeParse(input))
+
+      // then
+      expect(results.every((result) => !result.success)).toBe(true)
+    })
+  })
+})

src/config/schema/team-mode.ts

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+import { z } from "zod"
+
+/** Team Mode config - see .sisyphus/plans/team-mode.md (D-01/D-25). */
+export const TeamModeConfigSchema = z.object({
+  enabled: z.boolean().default(false),
+  tmux_visualization: z.boolean().default(false),
+  max_parallel_members: z.number().int().min(1).max(8).default(4),
+  max_members: z.number().int().min(1).max(8).default(8),
+  max_messages_per_run: z.number().int().min(1).default(10000),
+  max_wall_clock_minutes: z.number().int().min(1).default(120),
+  max_member_turns: z.number().int().min(1).default(500),
+  base_dir: z.string().optional(),
+  member_delegate_task_budget: z.number().int().min(0).default(0),
+  message_payload_max_bytes: z.number().int().min(1024).default(32768),
+  recipient_unread_max_bytes: z.number().int().min(1024).default(262144),
+  mailbox_poll_interval_ms: z.number().int().min(500).default(3000),
+})
+
+export type TeamModeConfig = z.infer<typeof TeamModeConfigSchema>