fix: suppress all GCM interactive prompts in credential store

.claude/agent-memory/archgate-developer/MEMORY.md

@@ -39,6 +39,7 @@ Skipping steps 2 or 3 is a workflow violation. The user should NEVER have to inv
 - **`CHANGELOG.md` is auto-generated — exclude from Prettier** — `CHANGELOG.md` is written by `TrigenSoftware/simple-release-action` during the release PR workflow. It is committed directly and never formatted by Prettier. It MUST be in `.prettierignore`; otherwise `bun run format:check` (part of `bun run validate`) will fail on the release PR. Do not attempt to run prettier on it post-commit.
 - **`mock.module("node:fetch", ...)` does NOT intercept `globalThis.fetch` in Bun** — Bun's runtime fetch is `globalThis.fetch`, not the `node:fetch` module. Using `mock.module` silently fails; the real network is hit. Always mock fetch by assigning `globalThis.fetch = mockFn as unknown as typeof fetch` directly, and restore via `mock.restore()` in `afterEach`. TypeScript type cast: `as never` is insufficient for the `typeof fetch` type (which includes `preconnect`) — always use `as unknown as typeof fetch`. Also captured in ARCH-005 Don'ts.
 - **Git credential tests need system-level isolation on Windows** — Overriding `Bun.env.HOME` is NOT sufficient to isolate `git credential fill/approve` calls in tests. Windows Credential Manager is a system-level API, not file-based. Tests MUST set `Bun.env.GIT_CONFIG_NOSYSTEM = "1"` and `Bun.env.GIT_CONFIG_GLOBAL = <path-to-empty-file>` to prevent git from reading the real credential helper config. Without this, tests on machines with stored credentials will pick up real tokens.
+- **GCM prompt suppression requires 5 env vars** — `GIT_TERMINAL_PROMPT=0` alone does NOT prevent Git Credential Manager (GCM) from showing GUI prompts on Windows or askpass prompts on Linux. The full set for `gitCredentialEnv()` in `src/helpers/credential-store.ts` is: `GIT_TERMINAL_PROMPT=0`, `GCM_INTERACTIVE=never`, `GCM_GUI_PROMPT=false`, `GIT_ASKPASS=""`, `SSH_ASKPASS=""`. Omitting any one can trigger unexpected prompts in editor/MCP contexts where the CLI runs as a subprocess.
 - **Module-level `{ ...Bun.env }` captures env at import time** — Spreading `Bun.env` into a module-level constant freezes the env snapshot. Tests that override `Bun.env.HOME` after import won't affect the constant. Fix: use a function that returns `{ ...Bun.env, ... }` on each call so it picks up test-time overrides. Applied in `src/helpers/credential-store.ts`.
 
 ## Validation Pipeline

.claude/settings.json

@@ -1,4 +1,5 @@
 {
+  "attribution": { "commit": "", "pr": "" },
   "permissions": {
     "allow": [
       "Bash(oxfmt *)",
@@ -18,7 +19,6 @@
       "Grep"
     ]
   },
-  "attribution": { "commit": "", "pr": "" },
   "hooks": {
     "PreToolUse": [
       {
@@ -44,5 +44,6 @@
         ]
       }
     ]
-  }
+  },
+  "enabledPlugins": { "sentry@claude-plugins-official": true }
 }

src/helpers/credential-store.ts

@@ -19,9 +19,27 @@ import { internalPath } from "./paths";
 const CREDENTIAL_HOST = "plugins.archgate.dev";
 const CREDENTIAL_TIMEOUT_MS = 3_000;
 
-/** Build env for git credential commands at call time (not import time). */
+/**
+ * Build env for git credential commands at call time (not import time).
+ *
+ * Suppresses ALL interactive prompts — terminal, GUI, and askpass — across
+ * platforms and Git Credential Manager (GCM) versions:
+ *
+ * - GIT_TERMINAL_PROMPT=0  — git's own terminal prompt
+ * - GCM_INTERACTIVE=never  — GCM interactive mode (terminal + GUI)
+ * - GCM_GUI_PROMPT=false   — GCM GUI-only prompt (Windows toast/dialog)
+ * - GIT_ASKPASS=""          — external askpass program
+ * - SSH_ASKPASS=""          — SSH askpass fallback (some helpers reuse it)
+ */
 function gitCredentialEnv(): Record<string, string | undefined> {
-  return { ...Bun.env, GIT_TERMINAL_PROMPT: "0", GCM_INTERACTIVE: "never" };
+  return {
+    ...Bun.env,
+    GIT_TERMINAL_PROMPT: "0",
+    GCM_INTERACTIVE: "never",
+    GCM_GUI_PROMPT: "false",
+    GIT_ASKPASS: "",
+    SSH_ASKPASS: "",
+  };
 }
 
 export interface StoredCredentials {