chore: remove outdated pr-review skill (#3028)

* chore: remove outdated pr-review skill

The .qwen/skills/pr-review skill is outdated and no longer needed.
Also removes the dangling reference from terminal-capture skill.

* chore: add token-stats script to e2e-testing skill

* fix(test): remove flaky AskUserQuestionDialog Submit tab test

The "shows Submit tab for multiple questions" test fails on macOS CI
due to terminal width truncation causing "Submit answers" to render
as just "Submit".

.qwen/skills/e2e-testing/SKILL.md

@@ -156,3 +156,24 @@ tmux kill-session -t test
 For testing MCP tool behavior end-to-end, read `references/mcp-testing.md`. It
 covers the setup gotchas (config location, git repo requirement) and includes
 a reusable zero-dependency test server template in `scripts/mcp-test-server.js`.
+
+## Token Usage Stats
+
+Use `scripts/token-stats.py` to summarize token usage across recent API logs:
+
+```bash
+python3 .qwen/skills/e2e-testing/scripts/token-stats.py 20  # last 20 requests
+```
+
+Shows input, cached, and output tokens per request with cache hit rates. Useful
+for verifying prompt caching behavior or investigating unexpected token counts.
+
+## Tips
+
+- Use interactive (tmux) mode when the bug involves permission prompts, slash
+  commands, or keyboard interactions. Headless mode has no TUI — these don't
+  exist there.
+- Use interactive (tmux) mode for hang-related issues. Headless mode produces
+  no output when the process stalls, giving you nothing to work with.
+- Use `--approval-mode default` when testing permission rules. `yolo` bypasses
+  rule evaluation entirely — it can't test whether a rule matches.