fix(shell): preserve task origin in job snapshots

[zhuowp]

No-Issue: backport of the independently tracked upstream fix for the Pinvou v0.9.5 maintenance branch.

Summary

• stamp shell work with its originating tool-call and turn identities
• preserve those identities in job snapshots, completion events, runtime handoff, and evidence artifacts
• keep legacy serialized jobs compatible through optional fields

Why

Background shell jobs outlive the tool call that created them. Without stable origin identity, an embedding host can attach a late failure from an earlier command to a newer tool card, especially when commands are identical or a wait call observes multiple jobs.

Scope

This is the Pinvou v0.9.5 fork backport of the reusable upstream fix proposed in Hmbown#5869. It deliberately does not add a revision counter or origin fields to generic tool-result metadata, because a wait result can summarize jobs from multiple origins.

Verification

• cargo check -p codewhale-tui --lib --locked
• focused origin, completion-event, runtime-handoff, legacy-JSON, and evidence tests
• cargo fmt --all
• git diff --check

Upstream: Hmbown#5869

[github-actions]

Thanks @zhuowp for taking the time to contribute.

This repository is observing a maintainer-managed PR intake gate in dry-run mode, so this pull request is staying open. This note helps maintainers prepare the allowlist before any enforcement is considered.

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