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.

bin/agenthub.js

@@ -1654,27 +1654,6 @@ async function cmdLanesAdd(args) {
   console.log(`${c.green("✔")} Created lane #${lane.id}: ${lane.title}`);
 }
 
-/**
- * `agenthub skills install` — copy this checkout's `skills/ship-feature-lane/`
- * into `~/.claude/skills/ship-feature-lane/`, so `/ship-feature-lane` is
- * discoverable from a session running inside any lane's own working
- * directory, not just inside this repo. Pure filesystem action; does not
- * talk to the dashboard server at all. Reinstall, not merge — overwrites an
- * existing global copy with the current one.
- */
-function cmdSkillsInstall() {
-  const { installShipFeatureLaneSkill } = require(
-    path.join(REPO_ROOT, "server", "lib", "skills-install.js")
-  );
-  try {
-    const result = installShipFeatureLaneSkill({ repoRoot: REPO_ROOT });
-    console.log(`${c.green("✔")} installed ship-feature-lane skill -> ${result.path}`);
-  } catch (err) {
-    console.error(`✖ ${err.message}`);
-    process.exitCode = 1;
-  }
-}
-
 /**
  * `agenthub lanes gc [--dry-run]` — reap orphaned Playwright MCP processes
  * (owning session died) and cap oversized hook logs, across every lane on
@@ -2417,25 +2396,6 @@ async function cmdLanesProofLink(args) {
   );
 }
 
-/** `agenthub lanes agents install [<id>] [--cwd path]` — write the ship-feature-lane
- *  agent templates (qc-local, senior-gate-reviewer) into <lane>/.claude/agents/,
- *  git-excluded. Never run automatically; a session calls it explicitly. */
-async function cmdLanesAgentsInstall(args) {
-  const resolved = await resolveLaneArg(args);
-  if (!resolved) return;
-  const result = await post(
-    `/api/lanes/${resolved.laneId}/agents/install`,
-    {},
-    { allowError: true }
-  );
-  if (result.status) {
-    console.error(`✖ agents install → ${result.data?.error?.message || result.status}`);
-    process.exitCode = 1;
-    return;
-  }
-  console.log(`${c.green("✔")} installed: ${result.installed.join(", ")}`);
-}
-
 /** `agenthub lanes mcp sync [<id>] [--cwd path]` — relocate the source repo's
  *  already-configured MCP servers into <lane>/.mcp.json and seed Chromium
  *  profiles. Never run automatically; a session calls it explicitly. */
@@ -2514,8 +2474,7 @@ async function cmdLanesCi(args) {
  * was display-only: the dashboard rendered a copy button and the operator
  * pasted it into a session by hand. This runs it, in the lane's own cwd:
  *
- *   - a slash command (`/superpowers:brainstorming`) starts `claude` with it
- *     as the prompt, exactly like `agenthub ship-full` does with the whole skill;
+ *   - a slash command starts `claude` with it as the prompt;
  *   - anything else (`npm test`, `agenthub lanes hook ci-gate`) is spawned directly.
  *
  * With no node id it lists the nodes and their commands, which is also the
@@ -2678,88 +2637,6 @@ async function cmdLanesShell(args) {
   });
 }
 
-/**
- * Start a `claude` session in this lane driven by a pipeline's own skill.
- * Two commands, two depths of work:
- *
- *   agenthub ship-full   → the 16-node `ship-feature` template, `/agenthub:ship-feature-lane`
- *                      — autonomous to a published PR, then watched until a
- *                        human merges it.
- *   agenthub ship-quick  → the 8-node `default` template, `/agenthub:ship-feature`
- *                      — in-repo feature work that stops at review/gate.
- *
- * Each command puts the lane on its own template, so the choice is the command
- * you type; the skill string itself lives in the template's `skill` field and
- * is never duplicated here.
- *
- * The prompt is passed as ONE argv element to `claude`, never through a shell —
- * a requirement containing quotes, `$`, or `;` is text, not code. `--print`
- * shows the exact command, switches nothing, and runs nothing.
- */
-const SHIP_TEMPLATES = {
-  "ship-full": "ship-feature",
-  "ship-quick": "default",
-};
-
-async function cmdShip(command, args) {
-  const templateId = SHIP_TEMPLATES[command];
-  const { flags, positional } = parseArgs(args);
-  const resolved = await resolveLaneArg(args);
-  if (!resolved) return;
-  let { lane } = await get(`/api/lanes/${resolved.laneId}`);
-
-  const { pipelines } = await get("/api/lanes/pipelines");
-  const skill = pipelines.find((p) => p.id === templateId)?.skill;
-  if (!skill) {
-    console.error(
-      `✖ pipeline template "${templateId}" declares no driving skill — ` +
-        `add a "skill" field to it (see docs/LANES.md § Custom template format)`
-    );
-    process.exitCode = 1;
-    return;
-  }
-
-  // `resolveLaneArg` only strips a leading bare lane id; the rest of the
-  // positionals are the requirement, joined back into one prompt line.
-  const requirement = positional
-    .filter((p) => p !== String(resolved.laneId))
-    .join(" ")
-    .trim();
-  const prompt = requirement ? `${skill} ${requirement}` : skill;
-
-  if (flags.print || !requirement) {
-    // `--print` shows what would run, so it switches nothing.
-    if (!requirement) console.error(`usage: agenthub ${command} "<requirement>" [<id>] [--print]`);
-    console.log(`cd ${lane.cwd} && claude ${JSON.stringify(prompt)}`);
-    if (!requirement) process.exitCode = 1;
-    return;
-  }
-
-  // The command picks the pipeline, not the lane's current setting: put the
-  // lane on the matching template first so the dashboard renders the right
-  // node count from the start rather than after the skill self-corrects.
-  if (lane.pipeline !== templateId) {
-    ({ lane } = await patch(`/api/lanes/${lane.id}`, { pipeline: templateId }));
-  }
-
-  console.log(
-    `${c.dim(`lane #${lane.id} · pipeline ${lane.pipeline} (${lane.pipeline_nodes.length} nodes)`)}\n` +
-      `${c.cyan("→")} claude ${JSON.stringify(prompt)}`
-  );
-  const child = spawn("claude", [prompt], { stdio: "inherit", cwd: lane.cwd });
-  await new Promise((resolve) => {
-    child.on("close", (code) => {
-      if (code) process.exitCode = code;
-      resolve();
-    });
-    child.on("error", (err) => {
-      console.error(c.red(`✖ ${err?.message || err}`));
-      process.exitCode = 1;
-      resolve();
-    });
-  });
-}
-
 async function cmdFeatureShow(args) {
   const slug = args.find((arg) => !arg.startsWith("--"));
   if (!slug) {
@@ -2938,16 +2815,6 @@ const COMMAND_GROUPS = [
         "[<node-id>] [extra…] [<id>] [--print]",
         "Run ONE pipeline node's own command in the lane's cwd (no id: list every node and its command)",
       ],
-      [
-        "ship-full",
-        '"<requirement>" [<id>] [--print]',
-        "Run the 16-stage lane pipeline: implement → gates → e2e → review → QC → senior gate → PR, watched until a human merges (--print: show the command, run nothing)",
-      ],
-      [
-        "ship-quick",
-        '"<requirement>" [<id>] [--print]',
-        "Run the 8-stage in-repo pipeline: plan → implement → tests → review → gate → ship. No PR, no browser QC",
-      ],
       [
         "lanes shell",
         "[<id>]",
@@ -2976,11 +2843,6 @@ const COMMAND_GROUPS = [
         "[<id>]",
         "Converge clone-root proof/ onto .playwright-mcp/proof (idempotent, never automatic)",
       ],
-      [
-        "lanes agents install",
-        "[<id>]",
-        "Write the ship-feature-lane agent templates (qc-local, senior-gate-reviewer) into <lane>/.claude/agents/, git-excluded",
-      ],
       [
         "lanes mcp sync",
         "[<id>]",
@@ -3001,11 +2863,6 @@ const COMMAND_GROUPS = [
         "[--dry-run]",
         "Reap orphaned Playwright MCP processes + cap oversized hook logs, across every lane",
       ],
-      [
-        "skills install",
-        "",
-        "Install skills/ship-feature-lane/ into ~/.claude/skills/ so /ship-feature-lane works from any lane",
-      ],
       [
         "lock status|acquire|release",
         "[<name>] [--holder X] [--timeout N]",
@@ -3832,9 +3689,6 @@ async function runCommand(argv) {
         return cmdLanesRuntime(rest[0], rest.slice(1));
       }
       if (rest[0] === "proof-link") return cmdLanesProofLink(rest.slice(1));
-      if (rest[0] === "agents" && rest[1] === "install") {
-        return cmdLanesAgentsInstall(rest.slice(2));
-      }
       if (rest[0] === "mcp" && rest[1] === "sync") {
         return cmdLanesMcpSync(rest.slice(2));
       }
@@ -3857,12 +3711,6 @@ async function runCommand(argv) {
         return cmdLanesGc(rest.slice(1));
       }
       return cmdLanes();
-    case "skills": {
-      if (rest[0] === "install") return cmdSkillsInstall();
-      console.error("usage: agenthub skills install");
-      process.exitCode = 1;
-      return;
-    }
     case "lock": {
       const sub = rest[0];
       if (sub === "status") return cmdLockStatus(rest.slice(1));
@@ -3876,9 +3724,6 @@ async function runCommand(argv) {
     }
     case "stage":
       return cmdStage(rest);
-    case "ship-full":
-    case "ship-quick":
-      return cmdShip(cmd, rest);
     case "feature": {
       const sub = rest[0];
       if (sub === "list") return cmdFeatureList(rest.slice(1));