refactor: apply minimal tfcode branding

- Rename packages/opencode → packages/tfcode (directory only)
- Rename bin/opencode → bin/tfcode (CLI binary)
- Rename .opencode → .tfcode (config directory)
- Update package.json name and bin field
- Update config directory path references (.tfcode)
- Keep internal code references as 'opencode' for easy upstream sync
- Keep @opencode-ai/* workspace package names

This minimal branding approach allows clean merges from upstream
opencode repository while providing tfcode branding for users.

packages/tfcode/test/share/share-next.test.ts

@@ -0,0 +1,76 @@
+import { test, expect, mock } from "bun:test"
+import { ShareNext } from "../../src/share/share-next"
+import { AccessToken, Account, AccountID, OrgID } from "../../src/account"
+import { Config } from "../../src/config/config"
+
+test("ShareNext.request uses legacy share API without active org account", async () => {
+  const originalActive = Account.active
+  const originalConfigGet = Config.get
+
+  Account.active = mock(async () => undefined)
+  Config.get = mock(async () => ({ enterprise: { url: "https://legacy-share.example.com" } }))
+
+  try {
+    const req = await ShareNext.request()
+
+    expect(req.api.create).toBe("/api/share")
+    expect(req.api.sync("shr_123")).toBe("/api/share/shr_123/sync")
+    expect(req.api.remove("shr_123")).toBe("/api/share/shr_123")
+    expect(req.api.data("shr_123")).toBe("/api/share/shr_123/data")
+    expect(req.baseUrl).toBe("https://legacy-share.example.com")
+    expect(req.headers).toEqual({})
+  } finally {
+    Account.active = originalActive
+    Config.get = originalConfigGet
+  }
+})
+
+test("ShareNext.request uses org share API with auth headers when account is active", async () => {
+  const originalActive = Account.active
+  const originalToken = Account.token
+
+  Account.active = mock(async () => ({
+    id: AccountID.make("account-1"),
+    email: "user@example.com",
+    url: "https://control.example.com",
+    active_org_id: OrgID.make("org-1"),
+  }))
+  Account.token = mock(async () => AccessToken.make("st_test_token"))
+
+  try {
+    const req = await ShareNext.request()
+
+    expect(req.api.create).toBe("/api/shares")
+    expect(req.api.sync("shr_123")).toBe("/api/shares/shr_123/sync")
+    expect(req.api.remove("shr_123")).toBe("/api/shares/shr_123")
+    expect(req.api.data("shr_123")).toBe("/api/shares/shr_123/data")
+    expect(req.baseUrl).toBe("https://control.example.com")
+    expect(req.headers).toEqual({
+      authorization: "Bearer st_test_token",
+      "x-org-id": "org-1",
+    })
+  } finally {
+    Account.active = originalActive
+    Account.token = originalToken
+  }
+})
+
+test("ShareNext.request fails when org account has no token", async () => {
+  const originalActive = Account.active
+  const originalToken = Account.token
+
+  Account.active = mock(async () => ({
+    id: AccountID.make("account-1"),
+    email: "user@example.com",
+    url: "https://control.example.com",
+    active_org_id: OrgID.make("org-1"),
+  }))
+  Account.token = mock(async () => undefined)
+
+  try {
+    await expect(ShareNext.request()).rejects.toThrow("No active account token available for sharing")
+  } finally {
+    Account.active = originalActive
+    Account.token = originalToken
+  }
+})