chore: add graft repo context graph integration

Add .claude/ config (settings, graft statusline and hooks helpers,
graft skill), .mcp.json and opencode.json MCP server entries, and
AGENTS.md with graft usage instructions. Add .ignore to re-admit
graft/ to ripgrep search while excluding its cache. Add /graft/ to
.gitignore since the graph is regenerable.

.claude/helpers/graft-hooks.cjs

@@ -0,0 +1,67 @@
+#!/usr/bin/env node
+const path = require('path');
+const fs = require('fs');
+const { pathToFileURL } = require('url');
+const { execFileSync } = require('child_process');
+const dir = process.env.CLAUDE_PROJECT_DIR || process.cwd();
+const BAKED = "/usr/lib/node_modules/@nanonets/graft/dist/claude";
+
+// The dist/claude dir of @nanonets/graft resolved from a base whose node_modules is searched.
+function fromPkg(base) {
+  try {
+    const pkg = require.resolve('@nanonets/graft/package.json', { paths: [base] });
+    return path.join(path.dirname(pkg), 'dist', 'claude');
+  } catch { return null; }
+}
+
+// The global node_modules dir per npm (handles Homebrew/Windows/volta). Queried on demand.
+function globalRoot() {
+  try {
+    const root = execFileSync('npm', ['root', '-g'], { encoding: 'utf8', stdio: ['ignore', 'pipe', 'ignore'], shell: process.platform === 'win32' }).trim();
+    return root || null;
+  } catch { return null; /* npm unavailable */ }
+}
+
+// The version of the package a dist/claude dir belongs to, or null if unreadable.
+function versionOf(distClaude) {
+  try {
+    return JSON.parse(fs.readFileSync(path.join(distClaude, '..', '..', 'package.json'), 'utf8')).version || null;
+  } catch { return null; }
+}
+
+// Numeric-dotted compare of the release part; an unreadable version loses to any known one.
+function newer(a, b) {
+  if (!a) return false;
+  if (!b) return true;
+  const p = (v) => String(v).split('-')[0].split('.').map((n) => Number(n) || 0);
+  const pa = p(a), pb = p(b);
+  for (let i = 0; i < Math.max(pa.length, pb.length); i++) {
+    const d = (pa[i] || 0) - (pb[i] || 0);
+    if (d !== 0) return d > 0;
+  }
+  return false;
+}
+
+// The highest-versioned dir in `dirs` that actually contains `name`, or null.
+function best(dirs, name) {
+  let bestDir = null, bestVer = null;
+  for (const d of dirs) {
+    if (!d || !fs.existsSync(path.join(d, name))) continue;
+    const v = versionOf(d);
+    if (bestDir === null || newer(v, bestVer)) { bestDir = d; bestVer = v; }
+  }
+  return bestDir;
+}
+
+function entry(name) {
+  // Cheap candidates first, and only shell out to npm when every one of them misses.
+  const cheap = [BAKED, fromPkg(dir), fromPkg(path.join(path.dirname(process.execPath), '..', 'lib'))];
+  const hit = best(cheap, name);
+  if (hit) return path.join(hit, name);
+  const gr = globalRoot();
+  const global = gr && path.join(gr, '@nanonets', 'graft', 'dist', 'claude');
+  if (global && fs.existsSync(path.join(global, name))) return path.join(global, name);
+  return path.join(dir, 'dist', 'claude', name); // last-ditch; import will no-op if absent
+}
+
+import(pathToFileURL(entry("hooks.js")).href).then((m) => m.main(process.argv[2])).catch(() => { /* graft unavailable — no-op */ });

.claude/helpers/graft-statusline.cjs

@@ -0,0 +1,67 @@
+#!/usr/bin/env node
+const path = require('path');
+const fs = require('fs');
+const { pathToFileURL } = require('url');
+const { execFileSync } = require('child_process');
+const dir = process.env.CLAUDE_PROJECT_DIR || process.cwd();
+const BAKED = "/usr/lib/node_modules/@nanonets/graft/dist/claude";
+
+// The dist/claude dir of @nanonets/graft resolved from a base whose node_modules is searched.
+function fromPkg(base) {
+  try {
+    const pkg = require.resolve('@nanonets/graft/package.json', { paths: [base] });
+    return path.join(path.dirname(pkg), 'dist', 'claude');
+  } catch { return null; }
+}
+
+// The global node_modules dir per npm (handles Homebrew/Windows/volta). Queried on demand.
+function globalRoot() {
+  try {
+    const root = execFileSync('npm', ['root', '-g'], { encoding: 'utf8', stdio: ['ignore', 'pipe', 'ignore'], shell: process.platform === 'win32' }).trim();
+    return root || null;
+  } catch { return null; /* npm unavailable */ }
+}
+
+// The version of the package a dist/claude dir belongs to, or null if unreadable.
+function versionOf(distClaude) {
+  try {
+    return JSON.parse(fs.readFileSync(path.join(distClaude, '..', '..', 'package.json'), 'utf8')).version || null;
+  } catch { return null; }
+}
+
+// Numeric-dotted compare of the release part; an unreadable version loses to any known one.
+function newer(a, b) {
+  if (!a) return false;
+  if (!b) return true;
+  const p = (v) => String(v).split('-')[0].split('.').map((n) => Number(n) || 0);
+  const pa = p(a), pb = p(b);
+  for (let i = 0; i < Math.max(pa.length, pb.length); i++) {
+    const d = (pa[i] || 0) - (pb[i] || 0);
+    if (d !== 0) return d > 0;
+  }
+  return false;
+}
+
+// The highest-versioned dir in `dirs` that actually contains `name`, or null.
+function best(dirs, name) {
+  let bestDir = null, bestVer = null;
+  for (const d of dirs) {
+    if (!d || !fs.existsSync(path.join(d, name))) continue;
+    const v = versionOf(d);
+    if (bestDir === null || newer(v, bestVer)) { bestDir = d; bestVer = v; }
+  }
+  return bestDir;
+}
+
+function entry(name) {
+  // Cheap candidates first, and only shell out to npm when every one of them misses.
+  const cheap = [BAKED, fromPkg(dir), fromPkg(path.join(path.dirname(process.execPath), '..', 'lib'))];
+  const hit = best(cheap, name);
+  if (hit) return path.join(hit, name);
+  const gr = globalRoot();
+  const global = gr && path.join(gr, '@nanonets', 'graft', 'dist', 'claude');
+  if (global && fs.existsSync(path.join(global, name))) return path.join(global, name);
+  return path.join(dir, 'dist', 'claude', name); // last-ditch; import will no-op if absent
+}
+
+import(pathToFileURL(entry("statusline.js")).href).then((m) => m.main()).catch(() => { /* graft unavailable — no-op */ });