Add wait-for-window-title regex (appear/vanish)

[JE-Chen]

Summary

Round-11, automation-core (sync lane). wait_for_window matches a title substring and only waits for appear; wait_until_window_closed is substring vanish. Neither supports a regex title or waiting for a title to match/vanish — e.g. a tab navigating to r".*— Checkout$".

Layers

• Headless core: extends smart_waits/waits.py — wait_until_window_title (regex by default via re.search, regex=False for substring; present=False for vanish) + pure _title_matches helper. Injectable title_lister. Returns the existing WaitOutcome.
• Facade: wait_until_window_title + WindowTitleLister re-exported + __all__.
• Executor: AC_wait_window_title.
• MCP: ac_wait_window_title.
• Script Builder: one CommandSpec under Flow.

Tests / docs

• test/unit_test/headless/test_wait_window_title_batch.py — 7 headless tests (regex appears, substring mode, vanish, timeout, validation + wiring + facade) via injected title lister.
• EN/Zh feature docs v126_features_doc.rst + toctrees; 3 WHATS_NEW entries.

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[codacy-production]

Not up to standards ⛔

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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