feat(prompt): 搜索引导改为意图→工具的正向指引，multi_grep 按上游保持关闭

真实会话中模型仍用 bash grep -o | sort -u 做抽取，被拒后直接放弃核对；
原提示词只说"不要"，没告诉它抽取/计数、给程序传文件清单、过滤命令输出时该用什么。

- routing：按已知信息选 grep/find（多变体用 grep 正则 alternation），
  codemode + tools.grep 做聚合，bash 文件清单用 git ls-files，
  overflow_query 过滤输出，被拒后改用替代方案继续
- 权限策略：rg/grep/git grep/find/fd 的 deny 附带指向替代工具的 reason
- tools.jsonc：grep/find 新 snippet，补上 codegraph_explore snippet
- FFF 上游标注 multi_grep 有害：wrapper 删除 PI_FFF_MULTIGREP，清理全部引用
- JSONC 测试改用字符串感知的注释剥离（reason 中含 'src/**/*.ts'）

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Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

config/prompt/tools.jsonc

@@ -18,7 +18,7 @@
     "edit": {
       "guidelines": [
         "Use edit with LINE#HASH anchors from the latest read or edit result for all file changes; batch every change to one file into a single edit call.",
-        "find/grep/multi_grep results carry plain line numbers, not LINE#HASH anchors; read the exact target range before editing.",
+        "find/grep results carry plain line numbers, not LINE#HASH anchors; read the exact target range before editing.",
         "Never reuse anchors from an earlier read or edit response once a newer one exists for the same file; treat only the most recent response as carrying valid anchors.",
         "After a successful edit, the returned --- Anchors --- block replaces a re-read for nearby follow-up edits.",
         "On [E_STALE_ANCHOR], the error lists the stale refs and any content-matched candidate anchors; re-read the file to get current anchors before retrying."
@@ -28,19 +28,18 @@
     "write": { "inherit": true },
     "ls": { "inherit": true },
     "powershell": { "inherit": true },
-    "grep": { "inherit": true },
-    "find": { "inherit": true },
-    "multi_grep": { "inherit": true },
+    "grep": { "snippet": "Search file contents via the FFF index (git-aware, smart-case, frecency-ranked, regex or literal); replaces bash grep/rg" },
+    "find": { "snippet": "Find files by fuzzy path or glob via the FFF index; replaces bash find/fd" },
     "tool_search": { "inherit": true },
     "codemode": {
       "guidelines": [
         "Use codemode to batch two or more independent tool calls (Promise.allSettled), chain dependent lookups, or filter large output down to what you need; call a single tool directly instead of wrapping it in a script.",
         "Call edit, write, ssh_connect, ssh_cd, ask_user_question, and Agent directly, never from a codemode script.",
-        "Inside scripts, search with tools.grep, tools.find, or tools.multi_grep; never run grep, find, rg, or fd through tools.bash."
+        "Inside scripts, search with tools.grep or tools.find and do extraction, dedup, and counting in JavaScript; never run grep, find, rg, or fd through tools.bash."
       ]
     },
 
-    "codegraph_explore": { "inherit": true },
+    "codegraph_explore": { "snippet": "Explore code structure from the CodeGraph index: symbols, relationships, call flows, and their source" },
     "lsp_diagnostics": { "inherit": true },
     "lsp_definition": { "inherit": true },
     "lsp_references": { "inherit": true },