refactor(lanes): drop the workflow skills and Superpowers link; pipelines go dormant
The plugin stops shipping its workflow layer: - skills/ship-feature and skills/ship-feature-lane, the 18 stage/ship slash commands (plugin.json keeps agenthub-doctor/update/open), and all four agents/ (qc-local, senior-gate-reviewer, backend-reviewer, frontend-reviewer). - CLI `agenthub skills install`, `agenthub lanes agents install`, `agenthub ship-full|ship-quick`; routes POST /api/skills/install and POST /api/lanes/:id/agents/install; the Settings button, the lane Tools menu item and the Add-lane setup step that called them. - The Superpowers auto-install: server/lib/skill-plugins.js, the bootstrap's autoInstallSkillPlugins / skillPluginsSettled gate and the doctor row. Pipelines are kept but dormant: server/data/pipelines/ is deleted, so no template ships. `default` resolves to EMPTY_PIPELINE (no nodes, progress 0), createLane still accepts it, POST /api/lanes/:id/stage answers 400 ENOPIPELINE, and the Workspace hides the stage timer, pickers, PipelineMap and strip stage chip for a lane with no nodes. A template dropped into DASHBOARD_PIPELINES_DIR turns it all back on. The server suite loads its templates from server/__tests__/fixtures/pipelines/. Docs: CLAUDE.md (marker, retired rules), README(.vi), INSTALL, ARCHITECTURE, docs/LANES|PLUGINS|CLI|API, agenthub-introduction.html.
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