fix(publication): coalesce result lineages

[steipete]

Summary

• Coalesce protocol-v2 exact-review publication deliveries by immutable lineage before batch claim.
• Keep the oldest pending slot's retry history while retaining the freshest known producer artifact.
• Preserve active-batch ownership and same-producer revision handoff.
• Add regressions for refreshed-producer retries, delayed older producers, and both legacy sibling orderings.

Reported by @snowzlmbot automation in #801. This maintainer-owned replacement supersedes that broken PR.

Fixes #800.

Proof

• pnpm run build:all
• Focused lineage and same-producer handoff tests passed.
• Autoreview completed clean with no findings.
• Local pnpm run check reached the complete suite but has unrelated host failures: missing GNU timeout, Linux-only capset assumptions, and macOS /private path normalization. Hosted CI is the full-suite gate for this exact head.

[clawsweeper]

ClawSweeper status: review started.

I am starting a fresh review of this pull request: fix(publication): coalesce result lineages This is item 1/1 in the current shard. Shard 0/1.

This placeholder means the worker is alive and reading the current context. I will edit this same comment with the actual review when the claws are done clicking.

Crustacean status: shell secured, claws on keyboard, evidence pebbles being sorted.