docs: HB-002 — four open questions blocking BACKLOG-per-row migration

[AceHack]

Summary

• Files HB-002 (Human Backlog item) capturing the four open questions that block migrating docs/BACKLOG.md from flat-file to per-row-file structure
• Stacked on top of land-upstream-rhythm-doc (docs: UPSTREAM-RHYTHM.md — Zeta's fork-first batched PR cadence #137) and previously merged batch 4 (Round 44 batch 4 of 6: GitHub surfaces + agent issue workflow #84); GitHub should show only the HB-002 delta after squash-merge detection

Test plan

• Review the four questions for completeness
• Confirm stacking base correctly detected

🤖 Generated with Claude Code

[chatgpt-codex-connector]

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[Copilot]

Pull request overview

Adds documentation and workflow scaffolding around GitHub surface triage + issue tracking, and records HB-002 as an open human decision item that blocks the backlog per-row-file migration.

Changes:

• Add docs/UPSTREAM-RHYTHM.md describing Zeta’s fork-first / batched upstream PR cadence.
• Add GitHub-surface playbooks + executable triage skill (docs/AGENT-GITHUB-SURFACES.md, docs/AGENT-ISSUE-WORKFLOW.md, .claude/skills/github-surface-triage/SKILL.md).
• Add GitHub Issue templates and extend docs/HUMAN-BACKLOG.md with HB-002.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 12 comments.

Show a summary per file

File	Description
docs/UPSTREAM-RHYTHM.md	New upstream cadence doc with concrete gh command procedures.
docs/HUMAN-BACKLOG.md	Adds HB-002 row capturing the four open questions blocking backlog restructure.
docs/AGENT-ISSUE-WORKFLOW.md	Defines adapter-neutral dual-track issue workflow and claim protocol.
docs/AGENT-GITHUB-SURFACES.md	Ten-surface GitHub triage playbook + cadence + taxonomy + references.
.github/ISSUE_TEMPLATE/human_ask.md	New “human ask” template for maintainer decisions.
.github/ISSUE_TEMPLATE/config.yml	Disables blank issues and adds contact links to key repo docs.
.github/ISSUE_TEMPLATE/bug_report.md	Replaces generic bug template with Zeta-specific structured bug intake.
.github/ISSUE_TEMPLATE/backlog_item.md	New structured backlog intake template aligned with in-repo durable tracking.
.claude/skills/github-surface-triage/SKILL.md	New checklist skill encoding the ten-surface sweep + logging discipline.