Move the identical in-memory child used by the per-call and persistent
host specs into tests/fake-child.ts, and move readProgramResult next to
the ProgramResult type it validates in protocol.ts.
Keep the stream side owned here: line bounds, the leading-brace check,
the write-queue limit and closure. On the birpc side, drop the strict
envelope validation, falsy-rejection normalization and fatal UTF-8
decoding. Calls to methods an endpoint does not own are answered with
birpc's error and unknown messages are ignored; the resolver still runs
only own methods and none after the endpoint closes.
- Reject a control line that does not start with "{", so another
release's length-prefixed frame fails as a protocol error instead of
waiting for a newline until the deadline.
- Bump SSH_PROTOCOL_VERSION to 3: executable helpers embed the PTC
worker, so an older helper is now rejected while connecting.
- Send a small error instead of a late binding result from a finished
persistent evaluation, so it cannot overflow the pipe shared with
the next evaluation.
- Leave per-call binding waits pending after the result instead of
rejecting them; unawaited calls crashed the child and leaked the
trace into the result logs.
- Pin birpc to 4.2.0 so the host and the bundled child agree, and
regenerate THIRD_PARTY_NOTICES.md.
- Update stale frame wording.
One pipe delivers each evaluation's messages before its result, and the
child refuses calls from finished evaluations, so the per-message
evaluation id protected nothing. Remove it with the checks, counters and
helpers it required, measure outgoing messages only when posting, and
replace rethrowing validation blocks with early refusals.
Replace the length-prefixed JsonChannel and hand-written request/reply
correlation with typed birpc methods over newline-delimited JSON. The
host calls the child's run(); bindings call the host's invoke(); logs
and output-limit reports are notifications. The transport bounds
incoming lines and queued writes, validates UTF-8 and exposed methods,
and rejects outstanding calls when the pipe closes.
Drop logic made obsolete by the new transport, including the 32-bit
frame-length bound on maxMessageBytes.
Hold cleanup of an older retained process while a newer call is waiting, then unload the provider. Require the pending call to reject after disposal without starting another process.
Validation: 305 focused tests passed, one skipped; persistent.ts, index.ts, and policy-processes.ts have 100% statements, branches, functions, and lines. Removing the shutdown guard makes the new regression fail.
Register calls before awaiting prior process cleanup. Carry policy cancellation into both Node execution modes and retain each admission until its call settles. Track persistent calls during provider disposal as well.
Cover unchanged-mode temporary escalation and policy changes that return to the original mode while cleanup is pending. Document the admission guarantee.
Validation: 308 focused tests passed, one skipped; both changed source files have 100% coverage. Two built-runtime smokes, two selected Session snapshots, all 43 doc-sync gates, and typed lint passed.
Add a parameterized admission regression for per-call and persistent-in-memory execution. Change the Session policy synchronously after submitting the runtime call and require cancellation before spawn.
The two new cases intentionally fail on the reviewed PR #5035 head: execution succeeds with danger-full-access after the Session becomes read-only. The 47 existing host-protocol and policy-process tests pass. No production changes.
_Kerman