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

CHANGELOG.md

@@ -14,6 +14,15 @@
   `dedupe_findings_tool` (fingerprint dedup, multi-source confidence boost,
   PR quality score), and `generate_report_tool` (standalone
   `code-review-report.html`). See `code_review_graph/scoring.py`.
+- Added the **project-review** workflow for whole-project or single-feature
+  code review independent of the git diff.  Scope is parsed from the user
+  instruction (全面/整个项目 → whole-project; otherwise feature + target
+  keyword).  `score_review_tool` gained an `all_files` parameter that scores
+  every source file in the graph.  Ships as a skill, an MCP prompt
+  (`project_review`), and the `/code-review-graph:project-review` command.
+- Added a Chinese Markdown review report alongside the HTML one;
+  `generate_report_tool` defaults to `format="both"` writing
+  `code-review-report.html` + `code-review-report.md`.
 
 - Added a Voyage AI embedding provider (`--provider voyage`, key from
   `VOYAGE_API_KEY`, opt-in request throttling via