Wire bake orchestrator and CLI

Connects scan + lock + pack + write into the full pipeline. CLI entry
parses args, dispatches to bake(), prints summary or error. Five
integration tests cover fresh bake, lock-aware ID preservation,
deleted-tile tracking, oversize hard-fail, and bit-identical
determinism across re-bakes.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

bin/atlas-baker.js

@@ -0,0 +1,48 @@
+#!/usr/bin/env node
+// CLI entry. Parses args, dispatches to bake(), prints summary.
+
+const { bake } = require('../src/bake');
+
+function parseArgs(argv) {
+    const opts = {};
+    for (let i = 0; i < argv.length; i++) {
+        const a = argv[i];
+        const next = argv[i + 1];
+        switch (a) {
+            case '--in':            opts.inDir = next;   i++; break;
+            case '--out':           opts.outDir = next;  i++; break;
+            case '--atlas-id':      opts.atlasId = next; i++; break;
+            case '--tile-size':
+                opts.tileSize = (next === 'auto') ? 'auto' : parseInt(next, 10);
+                i++;
+                break;
+            case '--max-size':      opts.maxSize  = parseInt(next, 10); i++; break;
+            case '--lock':          opts.lockPath = next; i++; break;
+            case '--blocks-sight-pattern':
+                opts.blocksSightPattern = new RegExp(next); i++; break;
+            case '--verbose':       opts.verbose = true; break;
+            default:
+                console.error(`unknown arg: ${a}`);
+                process.exit(2);
+        }
+    }
+    return opts;
+}
+
+(async () => {
+    try {
+        const opts = parseArgs(process.argv.slice(2));
+        const result = await bake(opts);
+        console.log(
+            `OK ${result.atlasId}: ${result.tileCount} tiles, `
+            + `${result.boundsW}x${result.boundsH} px atlas`
+        );
+        process.exit(0);
+    } catch (err) {
+        console.error('ERROR:', err.message);
+        if (err.scanErrors) {
+            for (const e of err.scanErrors) console.error('  ', e);
+        }
+        process.exit(1);
+    }
+})();