feat: add project-review workflow (whole-project / single-feature review)

Adds the project-review workflow for code review independent of the git
diff. The scope is parsed from the user instruction: 全面/整个项目 ->
whole-project (score every source file), otherwise feature + target
keyword (locate the code with semantic search + graph queries).

- scoring_tools.py: score_review_func gains all_files=True to score every
  source file in the graph via store.get_all_files()
- main.py: score_review_tool gains all_files param; registers the
  project_review MCP prompt (prompts 6->7)
- prompts.py: project_review_prompt(scope, target) with whole-project and
  feature branches (fixed a precedence bug that truncated the feature text)
- skills.py + skills/project-review/: new read-only project-review skill
  with shared checklists
- .opencode/command/code-review-graph-project-review.md: slash command
- tests: test_project_review.py (prompt rendering), TestProjectReviewPrompt,
  skill count assertions 5->6, all_files wiring checks
- docs: prompts (6->7) + project-review entries across COMMANDS, CLAUDE,
  README (+localized), INDEX, architecture, LLM-OPTIMIZED-REFERENCE,
  CHANGELOG

tests/test_prompts.py

@@ -7,6 +7,7 @@ from code_review_graph.prompts import (
     debug_issue_prompt,
     onboard_developer_prompt,
     pre_merge_check_prompt,
+    project_review_prompt,
     review_changes_prompt,
     unified_review_prompt,
 )
@@ -214,6 +215,58 @@ class TestUnifiedReviewPrompt:
         assert "FAIL" in _text(result[0])
 
 
+class TestProjectReviewPrompt:
+    def test_returns_list_with_messages(self):
+        result = project_review_prompt()
+        assert isinstance(result, list)
+        assert len(result) >= 1
+
+    def test_message_has_role_and_content(self):
+        result = project_review_prompt()
+        for msg in result:
+            assert isinstance(msg, Message)
+            assert msg.role == "user"
+            assert _text(msg)
+
+    def test_default_whole_project_scope(self):
+        result = project_review_prompt()
+        text = _text(result[0])
+        assert "whole-project" in text
+        assert "all_files=True" in text
+
+    def test_feature_scope_with_target(self):
+        result = project_review_prompt(scope="feature", target="payment")
+        text = _text(result[0])
+        assert "scope=feature" in text
+        assert "target=payment" in text
+
+    def test_mentions_architecture_scan(self):
+        result = project_review_prompt()
+        text = _text(result[0])
+        assert "get_architecture_overview" in text
+        assert "list_communities" in text
+
+    def test_mentions_high_risk_scan(self):
+        result = project_review_prompt()
+        text = _text(result[0])
+        assert "get_knowledge_gaps" in text
+        assert "get_hub_nodes" in text
+
+    def test_feature_mentions_semantic_search(self):
+        result = project_review_prompt(scope="feature", target="auth")
+        text = _text(result[0])
+        assert "semantic_search_nodes" in text
+        assert "get_impact_radius" in text
+
+    def test_mentions_read_only(self):
+        result = project_review_prompt()
+        assert "READ-ONLY" in _text(result[0])
+
+    def test_mentions_generate_report(self):
+        result = project_review_prompt()
+        assert "generate_report" in _text(result[0])
+
+
 class TestTokenEfficiencyPreamble:
     """All prompts should include the token efficiency preamble."""
 
@@ -241,3 +294,7 @@ class TestTokenEfficiencyPreamble:
     def test_unified_review_has_preamble(self):
         result = unified_review_prompt()
         assert "get_minimal_context" in _text(result[0])
+
+    def test_project_review_has_preamble(self):
+        result = project_review_prompt()
+        assert "get_minimal_context" in _text(result[0])