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

README.md

@@ -321,7 +321,7 @@ The benchmark also runs an honest **co-change mode**: the predictor is seeded wi
 | **Wiki generation** | Auto-generate markdown wiki from community structure |
 | **Multi-repo registry** | Register multiple repos, search across all of them |
 | **Multi-repo daemon** | `crg-daemon` watches multiple repos as child processes, with health checks and auto-restart |
-| **MCP prompts** | 6 workflow templates: review, architecture, debug, onboard, pre-merge, unified-review |
+| **MCP prompts** | 7 workflow templates: review, architecture, debug, onboard, pre-merge, unified-review, project-review |
 | **Full-text search** | FTS5-powered hybrid search combining keyword and vector similarity |
 | **Local storage** | SQLite file in `.code-review-graph/`. Core graph storage needs no external database or cloud service. |
 | **Watch mode** | Continuous graph updates as you work |
@@ -501,10 +501,10 @@ Your AI assistant uses these automatically once the graph is built.
 | `cross_repo_search_tool` | Search across all registered repositories |
 | `score_review_tool` | Objective Layer-2 review metrics (good/warn/fail grades) |
 | `dedupe_findings_tool` | Fingerprint dedup + multi-source confidence merge |
-| `generate_report_tool` | Render the standalone HTML code review report |
+| `generate_report_tool` | Render the HTML and/or Markdown review report |
 
-**MCP Prompts** (6 workflow templates):
-`review_changes`, `architecture_map`, `debug_issue`, `onboard_developer`, `pre_merge_check`, `unified_review`
+**MCP Prompts** (7 workflow templates):
+`review_changes`, `architecture_map`, `debug_issue`, `onboard_developer`, `pre_merge_check`, `unified_review`, `project_review`
 
 </details>