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Peter Steinberger 3e4ab6bed8 refactor: retire pre-June import and verification compatibility (#156285)
* refactor: retire pre-June import and verification compatibility

Remove pre-June task, flow, and plugin-state sidecar imports, obsolete
runtime chunks, package/installer validation exceptions, the old MCP
attachment fallback, and the April self-upgrade lane with its orphan helpers.

Leave retired data files untouched and document migration through 2026.6.1.
Preserve June-and-later contracts and September delivery recovery receipts.

Refs #156190

* docs: route legacy upgrades through 2026.9.5

* test: await Telegram fixture lifecycle events

Replace the setup stopwatch with the actual stop event or terminal run outcome. Keep cancellation assertions and outer execution bounds, and prove early terminal outcomes fail promptly.
2026-09-23 02:22:22 -07:00
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