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breadth-17: Finalization atomicity

Agent report: partial Review pending

Session: completed

docs/spec-compiler-part-3-dfg.md, lines 2360–2368

Finalization is failure-atomic. It operates on a private clone of the complete program, validates every canonical graph and the whole-program thread, launch, channel, memory-root, symbol, and completion relations, constructs canonical bytes, invokes the Common finalizer, and publishes only the complete valid Artifact. There is no `is_finalized` operation attribute or partially finalized program state. A valid Common envelope, exact schema descriptor, canonical bytes, and successful independent family verification together define a finalized Artifact.

Execution provenance

The original pilot recorded the compiler hash and checkout revision separately; its binary build revision was not verified. Coverage follow-ups use separately identified rebuilt binaries. Original simulator binary hashes were not retained.

Original standalone-test agent report

This is exploratory evidence, not an accepted production-format PBT.

No author explanation recorded.

Reported numeric verdicts

seeds

100

verdicts

pass

100

by mutation

dangling graph symbol

accepted

0

fail

0

pass

15

dangling thread symbol

accepted

0

fail

0

pass

19

drop consumer launch

accepted

0

fail

0

pass

14

drop producer launch

accepted

0

fail

0

pass

17

duplicate producer launch

accepted

0

fail

0

pass

14

is finalized attr

accepted

11

fail

0

pass

11

valid

accepted

10

fail

0

pass

10

Tested obligations

• whole-program relation validation (channel producer/consumer binding, duplicate producer, graph.launch symbol, thread.launch symbol)
• failure atomicity at tool boundary: no output program on failure, complete program on success
• no is_finalized attribute introduced by the compiler
• no abnormal termination

Untested obligations

• private clone of the complete program
• canonical bytes construction
• Common finalizer invocation / valid Common envelope
• exact schema descriptor
• independent family verification
• collision-checked publication of the Artifact
• memory-root relation
• completion relation

Format

Reproduction

Measured subject code coverage

pending · Instrumented coverage follow-up in progress; original pilot did not collect profiles.

Coverage-preserving minimized cases: not measured

Published evidence