[SEP-2663] refactor!: remove 2025-11 experimental tasks#2128
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…ences) Removes the 2025-11 experimental tasks side-channel through Protocol: TaskManager, processInbound*/processOutbound*, task interception, the experimental.tasks.* client/server accessors, and all task-augmented request handling. Also extends beyond the implementation deletion to scrub remaining references in examples, docs, and comments. The only task-related symbol remaining in packages/*.ts is `taskSupport` in ToolExecutionSchema, kept solely to match spec.types.ts (which still declares it); both are removed together in the next commit (spec regen). CHANGELOG entries are preserved (historical record). Migration docs retain a brief removal note. `microtask`/`platformBackgroundTask` are JS/platform terminology, not MCP tasks. Satisfies: SEP-2663 (core-removal half; tasks are now Extensions Track).
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…geset, complete migration removal lists, fix stale counts, drop leftover task requirement entries
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…om spec-type entries, restore collateral cancellation test
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Removes the 2025-11 experimental tasks implementation per SEP-2663 (tasks moved to Extensions Track).
Motivation and Context
SEP-2663 removes tasks from the core protocol. This deletes
TaskManager, the task interception hooks inProtocol, andexperimental.tasks.*accessors.How Has This Been Tested?
Full suite green after rebase onto current main (
test:all,check:all,lint:all; e2e matrix 0 unexpected failures). Mechanical deletion; grep audit confirms notaskreferences remain inpackages/**exceptmicrotask/platformBackgroundTask(unrelated JS terms) andtaskSupportinToolExecutionSchema(removed when the schema next syncs from spec).Breaking Changes
Yes —
experimental.tasks.*removed. Seedocs/migration.md.Types of changes
Checklist