feat(pm): read issue state from GitHub

[proerror77]

Issue relationship

Closes #471

Change contract

Make issue show/status and PM help/dashboard read live GitHub issue state and native relationships without requiring a local .claude/epics mirror.

Out of scope

Close/reopen/sync mutations (#457), PRD publication (#468), lifecycle workflow (#467), historical reconciliation (#459), branch protection (#460), and broad legacy PM cleanup.

Dependency / merge order

#456 is merged. None; this read-only contract is independently mergeable and rollbackable.

Focused validation

• bash -n .claude/scripts/pm/help.sh .claude/scripts/pm/status.sh .claude/scripts/pm/test-github-first-issue-reads.sh
• shellcheck .claude/scripts/pm/help.sh .claude/scripts/pm/status.sh .claude/scripts/pm/test-github-first-issue-reads.sh
• Markdown Bash blocks: Bash syntax and ShellCheck PASS
• ./.claude/scripts/pm/test-github-first-issue-reads.sh — PASS
• Live native-field readback with gh issue view #471 — PASS
• git diff --check
• Standards review: PASS
• Spec review: PASS
• Scope: 5 files, 370 changed lines, below the 750-line guardrail

Rollout / rollback impact

Read-only command behavior only. Rollback is a normal revert; no issue metadata, workflow, repository setting, or runtime target is changed.

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Review details

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Configuration used: defaults

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📥 Commits

Reviewing files that changed from the base of the PR and between e141072 and f07e112.

📒 Files selected for processing (5)

• .claude/commands/pm/issue-show.md
• .claude/commands/pm/issue-status.md
• .claude/scripts/pm/help.sh
• .claude/scripts/pm/status.sh
• .claude/scripts/pm/test-github-first-issue-reads.sh

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