[douglasjarquin]

Summary

Closes #320.

Since #319, pr reconcile and sweep failed with ordjson: unsupported type *int on any PR whose review threads are anchored to a code line. The four optional line fields on a review thread (line, original_line, start_line, original_start_line) are now saved as a plain number, or null when absent, so an absent line stays distinct from line 0. Unanchored threads and PRs without threads are unchanged.

On 2026-10-19 this failure blocked observation of 29 of the 33 open PRs sum tracks (zumba/salt, security and compliance), and with it every cleanup waiting on those merges.

One file changed (go/internal/prcmd/threads.go). No test source was added or changed.

Verification

• Coordinator mise run verify on a2c80b1: pass (internal/cli 469s).
• Worker verify runner: worker run 20261019T155736Z-c90480a3 (pass); before/after CLI evidence for both review-thread scenarios.
• Independent review (Codex GPT-6 Luna): approve.

https://claude.ai/code/session_01LmjWPRZjxcGH3kQmkpRToB

Pipeline

Generated by sum

Stage	Status	Result
Intent	✅	Approved brief recorded
Rebase	✅	Up to date with main (main at 44214f0, observed 2026-10-19T18:14Z)
Review	✅	Passed
Test	✅	Passed; the run certifies no candidate
Document	✅	Passed
Lint	✅	Passed (mise run lint)
Push	✅	Pushed a2c80b1 to origin/sum/t-a7de4cb45be7
PR	✅	Open: #321
CI	➖	No checks reported for this PR (as of 2026-10-19T18:14Z)

Review summary

• Review focus: Nullable line anchors are serialized as integers or null and remain readable through the saved review-thread views.
• Limitation: Source inspection and recorded replay evidence only; no checks were rerun and no live GitHub query was made.