refactor: improve test isolation and DI for cache/port-utils/resolve-file-uri

- connected-providers-cache: extract factory pattern (createConnectedProvidersCacheStore) for testable cache dir injection
- port-utils.test: environment-independent tests with real socket probing and contiguous port detection
- resolve-file-uri.test: mock homedir instead of touching real home directory
- github-triage: update SKILL.md

src/agents/builtin-agents/resolve-file-uri.test.ts

@@ -1,20 +1,32 @@
-import { afterAll, beforeAll, describe, expect, test } from "bun:test"
+import { afterAll, beforeAll, describe, expect, mock, test } from "bun:test"
 import { mkdirSync, rmSync, writeFileSync } from "node:fs"
-import { homedir, tmpdir } from "node:os"
+import * as os from "node:os"
+import { tmpdir } from "node:os"
 import { join } from "node:path"
-import { resolvePromptAppend } from "./resolve-file-uri"
+
+const originalHomedir = os.homedir.bind(os)
+let mockedHomeDir = ""
+let moduleImportCounter = 0
+let resolvePromptAppend: typeof import("./resolve-file-uri").resolvePromptAppend
+
+mock.module("node:os", () => ({
+  ...os,
+  homedir: () => mockedHomeDir || originalHomedir(),
+}))
 
 describe("resolvePromptAppend", () => {
   const fixtureRoot = join(tmpdir(), `resolve-file-uri-${Date.now()}`)
   const configDir = join(fixtureRoot, "config")
-  const homeFixtureDir = join(homedir(), `.resolve-file-uri-home-${Date.now()}`)
+  const homeFixtureRoot = join(fixtureRoot, "home")
+  const homeFixtureDir = join(homeFixtureRoot, "fixture-home")
 
   const absoluteFilePath = join(fixtureRoot, "absolute.txt")
   const relativeFilePath = join(configDir, "relative.txt")
   const spacedFilePath = join(fixtureRoot, "with space.txt")
   const homeFilePath = join(homeFixtureDir, "home.txt")
 
-  beforeAll(() => {
+  beforeAll(async () => {
+    mockedHomeDir = homeFixtureRoot
     mkdirSync(fixtureRoot, { recursive: true })
     mkdirSync(configDir, { recursive: true })
     mkdirSync(homeFixtureDir, { recursive: true })
@@ -23,11 +35,14 @@ describe("resolvePromptAppend", () => {
     writeFileSync(relativeFilePath, "relative-content", "utf8")
     writeFileSync(spacedFilePath, "encoded-content", "utf8")
     writeFileSync(homeFilePath, "home-content", "utf8")
+
+    moduleImportCounter += 1
+    ;({ resolvePromptAppend } = await import(`./resolve-file-uri?test=${moduleImportCounter}`))
   })
 
   afterAll(() => {
     rmSync(fixtureRoot, { recursive: true, force: true })
-    rmSync(homeFixtureDir, { recursive: true, force: true })
+    mock.restore()
   })
 
   test("returns non-file URI strings unchanged", () => {
@@ -65,7 +80,7 @@ describe("resolvePromptAppend", () => {
 
   test("resolves home directory URI path", () => {
     //#given
-    const input = `file://~/${homeFixtureDir.split("/").pop()}/home.txt`
+    const input = "file://~/fixture-home/home.txt"
 
     //#when
     const resolved = resolvePromptAppend(input)