fix: resolve strict mode violations and stale text in E2E tests

- public.spec.ts: add exact:true for 'Start Free' (matched 3 links)
- navigation/history: add exact:true for 'Sessions' heading (matched
  'AI Sessions' and 'Flow Sessions' subheadings too)
- command-palette: 'Ask FlowPilot AI' → 'Troubleshoot with FlowPilot'
- CLAUDE.md: add warning not to use gh run watch (burns tokens)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

CLAUDE.md

@@ -221,8 +221,8 @@ cd backend && pip install httpx && python -m scripts.seed_trees
 # CI/CD debugging
 gh run list --limit 5                          # Recent CI runs
 gh run view <id> --log-failed                  # Failed job logs
-gh run watch <id> --exit-status                # Watch run until complete
 gh run view <id> --json jobs --jq '.jobs[] | {name: .name, conclusion: .conclusion}'
+# NEVER use `gh run watch` — it holds context open and burns tokens while waiting
 ```
 
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