fix(hooks): display WARNING to client when hook fails with onFailure: warn

[ambient-code]

Summary

• When a hook fails with onFailure: warn (the default), the WARNING log from _handle_hook_failure was emitted outside the context_log_source context manager, causing it to be tagged with SYSTEM source instead of the hook source (BEFORE_LEASE_HOOK / AFTER_LEASE_HOOK)
• Since only hook-sourced logs are shown to the client by default (without --exporter-logs), the warning was invisible
• Moved the failure handling inside context_log_source so the WARNING log is correctly tagged and always visible to the client
• Added a regression test that verifies the WARNING is emitted within the log source context

Fixes #246

Test plan

• All 33 hooks tests pass (including new regression test)
• All 140 CLI tests pass
• Linting passes (make lint-fix)
• E2e hooks tests H3/H4 verify warning display end-to-end

🤖 Generated with Claude Code

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