feat(project): automate Project status transitions (#8)

[andybaran]

Closes #8.

[andybaran]

🔬 Code review (code-review agent)

Verdict: APPROVED (after one revision round).

• Scope clean & parallel-merge safe: only references/projects.md, SKILL.md, tests/run.sh (no edits to files Bound all agent loops: explicit iteration caps + escalation to prevent infinite loops #9 owns: agent-prompts.md/evals/.github). No helper added — the approved docs+hooks fallback.
• gh command shapes verified against Projects v2 semantics: project view (node id for --project-id), field-list (Status field + option ids), item-list (.content.number→.id), item-edit (correct single-select flags), gh auth refresh -s project.
• Recipe resolves all dynamic ids each time; graceful no-op contract explicit (no Project / missing scope → print & continue, never hard-fail). SKILL Step 3/4 hooks + Quick-ref rows consistent with Core SKILL.md integration: verification gate, CI gating, safety rails, worktrees, code-review step #7.
• New smoke test genuinely asserts doc/SKILL content; grep -Fq -- hardening correct.
• One Minor fixed this round: added --limit 100 to both item-list calls so id-resolution stays robust past 30 board items.

Human orchestrator performing final squash-merge.