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.

.tfcode/tool/github-triage.ts

@@ -0,0 +1,116 @@
+/// <reference path="../env.d.ts" />
+import { tool } from "@opencode-ai/plugin"
+const TEAM = {
+  desktop: ["adamdotdevin", "iamdavidhill", "Brendonovich", "nexxeln"],
+  zen: ["fwang", "MrMushrooooom"],
+  tui: ["thdxr", "kommander", "rekram1-node"],
+  core: ["thdxr", "rekram1-node", "jlongster"],
+  docs: ["R44VC0RP"],
+  windows: ["Hona"],
+} as const
+
+const ASSIGNEES = [...new Set(Object.values(TEAM).flat())]
+
+function pick<T>(items: readonly T[]) {
+  return items[Math.floor(Math.random() * items.length)]!
+}
+
+function getIssueNumber(): number {
+  const issue = parseInt(process.env.ISSUE_NUMBER ?? "", 10)
+  if (!issue) throw new Error("ISSUE_NUMBER env var not set")
+  return issue
+}
+
+async function githubFetch(endpoint: string, options: RequestInit = {}) {
+  const response = await fetch(`https://api.github.com${endpoint}`, {
+    ...options,
+    headers: {
+      Authorization: `Bearer ${process.env.GITHUB_TOKEN}`,
+      Accept: "application/vnd.github+json",
+      "Content-Type": "application/json",
+      ...options.headers,
+    },
+  })
+  if (!response.ok) {
+    throw new Error(`GitHub API error: ${response.status} ${response.statusText}`)
+  }
+  return response.json()
+}
+
+export default tool({
+  description: `Use this tool to assign and/or label a GitHub issue.
+
+Choose labels and assignee using the current triage policy and ownership rules.
+Pick the most fitting labels for the issue and assign one owner.
+
+If unsure, choose the team/section with the most overlap with the issue and assign a member from that team at random.`,
+  args: {
+    assignee: tool.schema
+      .enum(ASSIGNEES as [string, ...string[]])
+      .describe("The username of the assignee")
+      .default("rekram1-node"),
+    labels: tool.schema
+      .array(tool.schema.enum(["nix", "opentui", "perf", "web", "desktop", "zen", "docs", "windows", "core"]))
+      .describe("The labels(s) to add to the issue")
+      .default([]),
+  },
+  async execute(args) {
+    const issue = getIssueNumber()
+    const owner = "anomalyco"
+    const repo = "opencode"
+
+    const results: string[] = []
+    let labels = [...new Set(args.labels.map((x) => (x === "desktop" ? "web" : x)))]
+    const web = labels.includes("web")
+    const text = `${process.env.ISSUE_TITLE ?? ""}\n${process.env.ISSUE_BODY ?? ""}`.toLowerCase()
+    const zen = /\bzen\b/.test(text) || text.includes("opencode black")
+    const nix = /\bnix(os)?\b/.test(text)
+
+    if (labels.includes("nix") && !nix) {
+      labels = labels.filter((x) => x !== "nix")
+      results.push("Dropped label: nix (issue does not mention nix)")
+    }
+
+    const assignee = nix ? "rekram1-node" : web ? pick(TEAM.desktop) : args.assignee
+
+    if (labels.includes("zen") && !zen) {
+      throw new Error("Only add the zen label when issue title/body contains 'zen'")
+    }
+
+    if (web && !nix && !(TEAM.desktop as readonly string[]).includes(assignee)) {
+      throw new Error("Web issues must be assigned to adamdotdevin, iamdavidhill, Brendonovich, or nexxeln")
+    }
+
+    if ((TEAM.zen as readonly string[]).includes(assignee) && !labels.includes("zen")) {
+      throw new Error("Only zen issues should be assigned to fwang or MrMushrooooom")
+    }
+
+    if (assignee === "Hona" && !labels.includes("windows")) {
+      throw new Error("Only windows issues should be assigned to Hona")
+    }
+
+    if (assignee === "R44VC0RP" && !labels.includes("docs")) {
+      throw new Error("Only docs issues should be assigned to R44VC0RP")
+    }
+
+    if (assignee === "kommander" && !labels.includes("opentui")) {
+      throw new Error("Only opentui issues should be assigned to kommander")
+    }
+
+    await githubFetch(`/repos/${owner}/${repo}/issues/${issue}/assignees`, {
+      method: "POST",
+      body: JSON.stringify({ assignees: [assignee] }),
+    })
+    results.push(`Assigned @${assignee} to issue #${issue}`)
+
+    if (labels.length > 0) {
+      await githubFetch(`/repos/${owner}/${repo}/issues/${issue}/labels`, {
+        method: "POST",
+        body: JSON.stringify({ labels }),
+      })
+      results.push(`Added labels: ${labels.join(", ")}`)
+    }
+
+    return results.join("\n")
+  },
+})