Issue #2015: product-code executor tasks were repeatedly routed to a
liaison-only agent because every routing path gated only on the coarse
role field, and several binding primitives had no guard at all.
- Add runtimeConfig.assignmentPolicy ("auto" | "explicit-only" | "none");
"none" can never be bound to implementation tasks by ANY path — no
override bypasses it (the liaison guarantee)
- Route every binding surface through one shared evaluator
(evaluateImplementationTaskBind): claimTaskForAgent, the previously
unguarded checkoutTask/assignTask primitives, selectNextTaskForAgent
(including the in-progress re-selection loop), scheduler auto-assign
pool, heartbeat inbox/auto-claim, fn_delegate_task, CLI agent-id
validation, and dashboard assign/checkout/inbox routes
- Lock project isolation with a regression test: a foreign-project
agent id is rejected by every binding primitive
- Expose Assignment Policy in Agent Detail settings; document in
docs/agents.md; add changeset
Fusion-Task-Id: FN-7851
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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