chore: add pull request template

.github/pull_request_template.md

@@ -0,0 +1,49 @@
+## Summary
+
+* 
+
+## Test plan
+
+* `cargo fmt --all --check`
+* `cargo clippy --all-targets -- -D warnings`
+* `cargo test --all-targets`
+
+### Manual verification
+
+<!-- Describe how a reviewer can manually verify the change.
+     If the change requires building the CLI with a local path override, include
+     setup/teardown steps so they can test with and without the fix. -->
+
+**Setup:**
+
+```bash
+# In the cli repo, temporarily override the engine dependency:
+cd cli/rust
+# Edit Cargo.toml → cli-engine = { features = ["pkce-auth"], path = "../../cli-engine" }
+cargo build --release && cp target/release/gddy ~/.local/bin/gddy
+```
+
+**Test WITHOUT the fix (baseline):**
+
+```bash
+cd cli-engine && git checkout main
+cd cli/rust && cargo build --release && cp target/release/gddy ~/.local/bin/gddy
+# <command to reproduce the issue>
+# Expected: <describe broken behavior>
+```
+
+**Test WITH the fix:**
+
+```bash
+cd cli-engine && git checkout <this-branch>
+cd cli/rust && cargo build --release && cp target/release/gddy ~/.local/bin/gddy
+# <same command>
+# Expected: <describe fixed behavior>
+```
+
+**Cleanup:**
+
+```bash
+# Revert cli/rust/Cargo.toml back to:
+# cli-engine = { features = ["pkce-auth"], version = "<published-version>" }
+```