diff --git a/.github/copilot-instructions.md b/.github/copilot-instructions.md
index 4f204a7f..fd876440 100644
--- a/.github/copilot-instructions.md
+++ b/.github/copilot-instructions.md
@@ -3,3 +3,14 @@
 All instructions for this repository are maintained in [`AGENTS.md`](../AGENTS.md) at the repository root.
 
 Please read and follow the guidance in that file.
+
+## Tech Stack
+
+- **Platform:** Google Apps Script (V8 runtime, deployed on Google Workspace)
+- **Language:** JavaScript (`.gs` files for GAS entry points, `.js` for testable logic)
+- **Testing:** Jest (`npm test` / `npx jest --runInBand`), with 100% line coverage required
+- **Linting:** ESLint (`npm run lint`)
+- **Formatting:** Prettier (`npx prettier --write .`)
+- **Package Manager:** npm
+- **Google Services:** GmailApp, DriveApp, CalendarApp, DocumentApp, SpreadsheetApp (injected as parameters for testability)
+- **CI:** GitHub Actions — runs Jest tests and coverage checks on every PR
diff --git a/.github/workflows/ci-failure-analyst.yml b/.github/workflows/ci-failure-analyst.yml
index bb0fd3c1..ecf3b6c8 100644
--- a/.github/workflows/ci-failure-analyst.yml
+++ b/.github/workflows/ci-failure-analyst.yml
@@ -18,7 +18,7 @@
 # Docs: https://github.com/petry-projects/.github-private/blob/main/docs/aw/ci-failure-analyst.md
 # ─────────────────────────────────────────────────────────────────────────────
 
-name: "CI Failure Analyst"
+name: 'CI Failure Analyst'
 
 on:
   check_run:
@@ -26,13 +26,13 @@ on:
 
 permissions:
   pull-requests: write
-  issues: write        # post/read PR comments via the Issues comments API
+  issues: write # post/read PR comments via the Issues comments API
   actions: read
   contents: read
   checks: read
 
 concurrency:
-  group: "ci-failure-analyst-${{ github.event.check_run.head_sha }}"
+  group: 'ci-failure-analyst-${{ github.event.check_run.head_sha }}'
   cancel-in-progress: false
 
 jobs:
diff --git a/.gitignore b/.gitignore
index 6c5b4cd5..441f30a8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,3 +10,4 @@ playwright-report/
 # compliance-ci-trigger
 # ci-trigger-298
 .dev-lead/
+.dev-lead/