fix(config): bound ConfigWatcher stop-path drain

[tkhquang]

Summary

• Bound the ConfigWatcher stop-path drain (timed wait, then directory-handle close to force IRP completion, then leak the heap-bundled I/O buffer) so a deleted watched directory cannot hang teardown.
• Refresh the ConfigWatcher docs and reflow aob-signatures.md section 4.7 to the document's long-line convention (pure reformat, no content change).

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 27678dd8-031a-4e41-8f0c-4dca999fd077

📥 Commits

Reviewing files that changed from the base of the PR and between 6837d1d and 9973987.

📒 Files selected for processing (5)

• AGENTS.md
• docs/config-hot-reload/README.md
• docs/misc/aob-signatures.md
• src/config_watcher.cpp
• tests/test_config_watcher.cpp

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