Fix KB loading bugs and add jailed KB read/search tools (0.1.71).

- Strip UTF-8 BOM before parsing MANIFEST.json (PowerShell 5.1 output).
- kb.reload force-republishes so edited SKILL.md / new local_skills / identity apply.
- Duplicate or rejected pack skills are skipped instead of unregistering the whole pack.
- kb-context and every pack skill carry resolved absolute paths.* anchors; KB_PATHS env.
- Inline {paths.local}/identity/*.md into kb-context (capped).
- New netx__kbSearch / netx__kbRead host tools, realpath-jailed to kbRoot.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/INSTALL.md

@@ -22,7 +22,7 @@ dsh web
 使用已经下载的发布包，例如：
 
 ```powershell
-dsh plugin --profile web add "D:\Downloads\dsh-netxops-0.1.70.tgz"
+dsh plugin --profile web add "D:\Downloads\dsh-netxops-0.1.71.tgz"
 dsh web
 ```