refactor(timeline): attachment prep — canonical identity + snapshot-equivalence/schema-policy extraction#6424
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Skill-Update: skip skill=web-plugins reason="identity ownership bookkeeping does not change browser plugin behavior"
Skill-Update: skip skill=timeline reason="internal schema policy extraction does not change timeline usage" Skill-Update: skip skill=web-plugins reason="source closure is unchanged by internal extraction"
Skill-Update: skip skill=timeline reason="source manifest now owns the extracted implementation" Skill-Update: skip skill=web-plugins reason="WAM and WebCLAP source closure stays behaviorally identical"
Skill-Update: skip skill=timeline reason="internal schema policy now consistently drives decode and preflight" Skill-Update: skip skill=web-plugins reason="serialized Track compatibility is unchanged"
Name the four source lists a new engine translation unit belongs to, and note that the closure check compares only the WAM and WebCLAP lanes, so a missing no-exceptions entry fails at link time rather than in the check. Record that extracting a helper out of an already-listed translation unit produces a new unit with the same obligation, which reads as a pure refactor because the origin unit stays listed everywhere.
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Architecture-prep slice for the Creative Timeline Engine Phase 2 attachment work. Eight focused commits, timeline-only surface.
What
ItemLocationgains aparent_id; ownership iskind + immediate parentviahas_same_owner, with a sharedimmediate_parent_id()derivation. Legacy snapshots withoutparent_idbackfill deterministically on decode.reactivated_locationpredicate.same_projectwalk moves into a sharedsnapshot_equivalenceTU.track_schema_policy.hpp, consumed by encode/decode/preflight/registry/structural-validation, replacing scatteredversion == 1/2literals with arequires_device_chain(version)predicate.snapshot_equivalence.cpplands in all four engine source lists (native, no-exceptions object lib, WAM, WebCLAP); web-plugins SKILL.md records the four-list closure obligation.Validation (exact rebased head)
ItemLocationlayout change compiles everywhere).🤖 Generated with Claude Code
🔎 Provenance
claudem3/Volumes/Workshop/Code/pulp-cte-p4-prepc66f4a64-25ea-42e5-b184-d48611a066a2Resume
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Restore URL — https://claude.ai/code/session_01TVQHcnbg3t6TvXsdv6gXhS
stamped 2026-07-21 05:31 UTC