The producer-source refactor introduced the unreleased V4 discriminator
code-mode even though this source identifies images deferred from successful
PTC subcalls. Name it ptc-mode before V4 ships so persisted attribution
matches the producer and does not freeze obsolete terminology into new logs.
Keep the live writer, V3-to-V4 migration output, collision guard, and reserved
producer policy aligned. Both released tools-code-mode and tools-ptc plugin
lookup keys map to ptc-mode. Preserve those historical keys, opaque message
text and IDs, all frozen V0-to-V3 generations, and recorded Session inputs.
Update the owning tests, producer documentation, current catalog, and V4
acknowledgement. The canonical schema audit identifies exactly three changed
roots; reversing only the source literal restores each prior digest. The
large generated JSON diff comes from graph ordering, with 61 roots and 572
types retained.
Validation: the seven-file focused run passed 298 tests and exposed four
stale current-output expectations in two migration files. After correcting
those expectations, both files passed all 23 tests. All 41 documentation
gates and full lint passed; frozen generations and recorded inputs are
unchanged.
Traversal ordinals and first-owner paths gave shared persistence types
unstable display names. Keep authored names and source locations as metadata,
use structural digests for identity, and render complete kind/form groups
with bounded array labels. Preserve historical rendering and stored graphs.
Record supported source compatibility promises with their property binding,
policy version, discriminator, preservation rule, and qualified kind set.
The extractor and classifier require explicit opt-ins in both compared
schemas; ordinary or unsupported changes retain strict classification.
Policy-bearing graphs use the format-2 fingerprint domain while unannotated
graphs keep their format-1 fingerprints. Runtime owners activate bindings
only with the corresponding reader behavior; this tooling layer activates
none and changes no package source or Session generation.
Provide a read-only before/after review command that groups shared structural
evidence without replacing authoritative compatibility diagnostics. Match
changed alternatives only through unique literal discriminators and retain
ambiguous additions and removals as independent facts.
At the X baseline, all 61 roots and 472 schemas, digests, and source fields
are unchanged. The inventory remains format 1 and removes only 296 synthetic
names. Existing acknowledgement history still matches every root. All 195
focused tooling tests, Host build/full lint, and bilingual pairing pass.
Tianyi Cui