Wire the async source runtimes into the hosts - #4392

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TrueDoctor wants to merge 22 commits into

async-pr2-cutoverfrom

async-pr3-source-wiring

Commits on Jul 31, 2026

Add the core execution types, the borrowed context, and the seeded u64 fx hasher
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Fix frame table key aliasing and arena handle offset truncation
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Drop arena entries in reverse allocation order and require Send + Sync payloads
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Draw arena generations from a global counter so foreign handles never upgrade
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Forward serialize through node wrappers and free abandoned frame table reservations
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Make arena generation exhaustion fallible with an unsafe counter rewind
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Guard the shared generation counter in tests and reject oversized batch ranges
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Park the arena during drop glue, guard filled batches, and normalize deserialized sources
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Make the sources fields private and normalize them on every mutation
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Remove the unused CtxSnapshot scope reconstruction
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Cut over to the graphene execution model
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Adapt the cutover to the reviewed core-types API
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Silence the dead-code warnings for groundwork the host wiring will use
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Commits on Aug 3, 2026

Poll source tasks once at spawn and land inline completions in the first eval
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