Add blocking wait-until-vanish (wait_until_gone / image / text)

[JE-Chen]

Summary

Round-11, automation-core. wait_for_image/wait_for_text block until something appears and observer fires async callbacks on vanish, but there was no blocking "wait until this spinner/toast/dialog disappears then continue" for an image or text (wait_until_window_closed covers windows only). Adds the missing vanish waits to the smart_waits family.

Layers

• Headless core: extends je_auto_control/utils/smart_waits/waits.py — generic wait_until_gone(present, ...) (any predicate → loop is headless-testable), plus wait_until_image_gone / wait_until_text_gone building the predicate from the locate functions. Returns the existing WaitOutcome. gone_for_s debounces flicker.
• Facade: all three re-exported + __all__.
• Executor: AC_wait_image_gone, AC_wait_text_gone.
• MCP: ac_wait_image_gone / ac_wait_text_gone.
• Script Builder: two CommandSpecs under Flow.

Tests / docs

• test/unit_test/headless/test_wait_gone_batch.py — 7 headless tests (predicate flips to false, already-gone immediate, timeout, validation, gone_for_s sustained-absence + wiring + facade) — all via injected predicates, no real screen.
• EN/Zh feature docs v118_features_doc.rst + toctrees; 3 WHATS_NEW changelog 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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