chore: close multi-track sprint — 6/6, epic #289 dev-backlog side done

[sungjunlee]

Closes out backlog/sprints/2026-07-multi-track-sprints.md via sprint-close.sh (dogfooding the close flow shipped this sprint): status: completed, 6/6 tasks, pre-close doctor 8/8 PASS. Durable Running Context promoted to _context.md:

• the scopesOverlap() single-predicate rule + G4 text-anchor convention (Architecture Decisions)
• the charter-O1 wording clarification candidate — human-gated, still open (Known Gotchas)

The close's reassess signal fired (3 sprints closed since backlog/triage/2026-07-04-reassess.md, threshold 3) — surfaced to the operator rather than auto-run, per the report-only rule.

Refs #289.

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📥 Commits

Reviewing files that changed from the base of the PR and between 0b9eea7 and f940bae.

📒 Files selected for processing (2)

• backlog/sprints/2026-07-multi-track-sprints.md
• backlog/sprints/_context.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/close-multitrack-sprint

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