livetribe / yama / 29980290988

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Add lifecycle execution helpers and behavioral contract

The runtime-support package rt now holds the machinery generated code
drives: interceptor chains, the per-component wrapper, the level
runner, the quiesce-then-teardown state machine, the Wire cleanup
adapter, and the overrun interceptor. It lives in rt/internal/exec,
sealed behind an exported LifecycleBuilder, so generated code depends
only on the builder.

Levels run in dependency order: startup forward, shutdown back, every
quiesce before any teardown. A level's members run concurrently and
fail fast without cancelling their siblings. Panics are recovered at
the level runner, never in the chain. A start that ran nothing stays
reusable; one that started components and then failed is torn down and
spent.

The shape generated code must take is pinned as a built exemplar, and
the contract is exercised through stand-ins that match it.

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350 of 789 relevant lines covered (44.36%)

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