fix(merge-gate): raise Tools auto-merge size limit via gate-config

Tool + tests + docs PRs routinely exceed the 800-line UI default.
Make limits config-driven (2000 lines) and stop treating pyproject.toml
as a hard sensitive path so optional tool deps can auto-merge.

.github/scripts/gate-config.js

@@ -5,10 +5,13 @@
 module.exports = {
   repoFullName: 'MervinPraison/PraisonAI-Tools',
   productPathPrefixes: ['praisonai_tools/', 'tests/'],
+  // Workflows stay gated; pyproject.toml is normal for optional tool deps.
   sensitivePathPatterns: [
     /^\.github\/workflows\//,
-    /^pyproject\.toml$/,
   ],
+  // Tool + tests + docs routinely exceed the UI/SDK 800-line default.
+  maxAutoAdditions: 2000,
+  maxAutoFiles: 30,
   requiredCheckPatterns: [/^ci$/i, /python/i, /test/i, /lint/i, /ruff/i],
   ciWorkflowFile: 'ci.yml',
   ciWorkflowName: 'CI',

.github/scripts/merge-gate-selftest.js

@@ -247,8 +247,11 @@ assert('product code with tests ok', mg.missingTestsReason([
   { filename: 'tests/test_x.py', additions: 10 },
 ]) === null);
 
-// PR size
-assert('large PR blocked', mg.prSizeReasons([{ additions: 900 }]).length > 0);
+// PR size (threshold from gate-config; Tools allows larger tool+tests+docs PRs)
+const sizeLimit = config.maxAutoAdditions ?? 800;
+assert('under size limit ok', mg.prSizeReasons([{ additions: sizeLimit }]).length === 0);
+assert('large PR blocked', mg.prSizeReasons([{ additions: sizeLimit + 1 }]).length > 0);
+assert('typical tool PR under Tools limit', mg.prSizeReasons([{ additions: 1510 }]).length === 0);
 
 assert('internal PR link accepted', mg.isInternalPullRequestLink(
   { base: { repo: { full_name: config.repoFullName } } },

.github/scripts/merge-gate.js

@@ -14,8 +14,8 @@ const STALE_FINAL_MAX_PER_WINDOW = 2;
 const PUSH_AFTER_FINAL_DEBOUNCE_MS = 15 * 60 * 1000;
 const ALLOWED_MERGE_STATES = new Set(['CLEAN', 'UNSTABLE']);
 const AGENT_PY_MAX_AUTO_LINES = 100;
-const PR_MAX_AUTO_ADDITIONS = 800;
-const PR_MAX_AUTO_FILES = 30;
+const PR_MAX_AUTO_ADDITIONS = config.maxAutoAdditions ?? 800;
+const PR_MAX_AUTO_FILES = config.maxAutoFiles ?? 30;
 const MANUAL_ONLY_LABELS = new Set(['security', 'breaking-change', 'needs-manual-review', 'release']);
 const WORKFLOW_ONLY_LABEL = 'merge-gate-ci-only';
 const CI_ONLY_PATH_PREFIXES = ['.github/workflows/', '.github/actions/', '.github/scripts/merge-gate'];