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/bin/tfcode

@@ -26,7 +26,7 @@ const scriptPath = fs.realpathSync(__filename)
 const scriptDir = path.dirname(scriptPath)
 
 //
-const cached = path.join(scriptDir, ".opencode")
+const cached = path.join(scriptDir, ".tfcode")
 if (fs.existsSync(cached)) {
   run(cached)
 }

packages/tfcode/package.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://json.schemastore.org/package.json",
   "version": "1.3.0",
-  "name": "opencode",
+  "name": "tfcode",
   "type": "module",
   "license": "MIT",
   "private": true,
@@ -20,7 +20,7 @@
     "db": "bun drizzle-kit"
   },
   "bin": {
-    "opencode": "./bin/opencode"
+    "tfcode": "./bin/tfcode"
   },
   "randomField": "this-is-a-random-value-12345",
   "exports": {

packages/tfcode/src/agent/agent.ts

@@ -104,7 +104,7 @@ export namespace Agent {
             },
             edit: {
               "*": "deny",
-              [path.join(".opencode", "plans", "*.md")]: "allow",
+              [path.join(".tfcode", "plans", "*.md")]: "allow",
               [path.relative(Instance.worktree, path.join(Global.Path.data, path.join("plans", "*.md")))]: "allow",
             },
           }),

packages/tfcode/src/cli/cmd/agent.ts

@@ -99,7 +99,7 @@ const AgentCreateCommand = cmd({
             scope = scopeResult
           }
           targetPath = path.join(
-            scope === "global" ? Global.Path.config : path.join(Instance.worktree, ".opencode"),
+            scope === "global" ? Global.Path.config : path.join(Instance.worktree, ".tfcode"),
             "agent",
           )
         }

packages/tfcode/src/cli/cmd/mcp.ts

@@ -381,11 +381,11 @@ export const McpLogoutCommand = cmd({
 })
 
 async function resolveConfigPath(baseDir: string, global = false) {
-  // Check for existing config files (prefer .jsonc over .json, check .opencode/ subdirectory too)
+  // Check for existing config files (prefer .jsonc over .json, check .tfcode/ subdirectory too)
   const candidates = [path.join(baseDir, "opencode.json"), path.join(baseDir, "opencode.jsonc")]
 
   if (!global) {
-    candidates.push(path.join(baseDir, ".opencode", "opencode.json"), path.join(baseDir, ".opencode", "opencode.jsonc"))
+    candidates.push(path.join(baseDir, ".tfcode", "opencode.json"), path.join(baseDir, ".tfcode", "opencode.jsonc"))
   }
 
   for (const candidate of candidates) {