[TS PBT] Compose campaign artifacts and existing edge guidance

[CaelmBleidd]

The existing campaign artifacts, native witness results and edge-guidance stack do not compose without serialization, deadline and assertion compatibility fixes. Serialize the existing portable edge trace, map initial coverage once, preserve both caller-deadline entry points, and migrate existing assertions to native witness results. Scheduling policy is unchanged.

Own diff against the immediate assembly base: 8 files, +52/-38. This PR contains four own commits. The assembly branch contains existing dependency merges only:

• main e56cea501 (including [TS] Reuse closest-to-uncovered NURS for external coverage #526)
• [TS PBT] Record scoped campaign metadata and observed Node versions #548 b3208962c6708e4a85e9d10b6dd7ea30a4155f27
• [TS PBT] Guide original property search with admitted edge coverage #524 024804408f2873130b810c24c25911a72aeedca8
• [TS PBT] Confirm DSL candidates without random regeneration #566 6fd488f54c4664b6a5ff240dcd0dd2db67908b3a
• [TS PBT] Preserve runtime limitation diagnostics in property search #560 66fd1f3add914b8b3f309eaf391d1e01f67d6249

Frozen assembly: 342a042ef04c5bd34f202952a7fbb4751c3982c9. Its inherited implementation is excluded from this PR diff. After the dependencies merge, move only the four own commits onto main and retarget this PR; do not merge the assembly wholesale.

Validation: 10 real backend edge/runtime regressions passed; Detekt main/test for both PBT modules reports zero findings. Existing direct campaign and edge-guidance checks also passed on the assembled dependencies before consumer behavior was added. No comparative coverage benefit is claimed.