Plan a Phased Build

Project Context

• CLAUDE.md: !find . -maxdepth 1 -name "CLAUDE.md" -type f
• project-discovery.md: !find . -maxdepth 3 -name "project-discovery.md" -type f
• personal config directory: !bash "${CLAUDE_PLUGIN_ROOT}/scripts/han-config-dir.sh" 2>/dev/null || echo "$HOME/.claude"
• project .han/config.md: !cat .han/config.md 2>/dev/null || echo ""

As your first action, use the Read tool on .han/config.md inside the personal config directory path above. A read that returns no file is no personal configuration: continue silently. When that file or the project .han/config.md probe supplies content, apply it per config-rule.md, which governs precedence between the two files, relative-path resolution, and what to do with a file that reads but cannot be used.

Operating Principles

• Plain language is the default surface. The build-phase outline never contains file paths, line numbers, function or class names, library mechanics, or language primitives. It uses product-level subsystem names ("the events processing system", "the database"), user-facing UI vocabulary (popover, modal, toast), behavioral verbs (publishes, retries, expires), and user-observable states. Brand names generalize one level up — "PostgreSQL" → "the database", "NATS JetStream" → "the events processing system". A non-technical stakeholder must be able to read the document end-to-end.
• Every phase must be demonstrable to a real person. "Demonstrable" means a person can be put in front of the running result and see something happen end-to-end — not "we shipped a service", but "you can do X and Y happens". If a phase is not demoable, it is either too small (merge it forward into the next phase that does become demoable) or too horizontal (it is a layer, not a slice — re-think it as a thinner end-to-end strip).
• Every phase builds on the prior. As phases ship, the system becomes progressively more capable. Earlier phases stay valid; later phases enrich what earlier ones delivered. Never sequence a phase so that it invalidates an earlier deliverable.
• Vertical slices, not horizontal layers. The first feature-shipping phase has every layer of the system involved end-to-end for one narrow scenario. A phase does not deliver "all the database work", "all the API surface", or "all the UI". Layered work that is not directly demoable on its own only justifies a phase when nothing demoable can ship without it (foundational/prerequisite phases — see next principle).
• Foundational or prerequisite phases come first only when truly required. If the demoable feature literally cannot run until a setting, permission model, schema, or configuration foundation exists, that foundation comes first — and even then the foundation phase must itself be demoable on its own (an admin can edit the new setting page and see the value persist, for example). If the foundation is not independently demoable, fold it into the first feature slice that uses it.
• Traceability back to source is non-negotiable. Every phase cites the section(s) of the source artifact that drove it. The reader can always answer "where did this phase come from?" without leaving the document.
• The run stays inside the boundary it descends from. Before phasing anything, the skill records the work item's stated scope and exclusions, plus whatever scope the user stated when invoking it, per