fix: remove redundant hooks declaration from plugin.json

[nextbridgehq]

Summary

.claude-plugin/plugin.json declares "hooks": "./hooks/hooks.json", which
the plugin runtime already loads by convention (the standard
hooks/hooks.json path). Declaring it explicitly causes plugin installation
to fail with:

Hook load failed: Duplicate hooks file detected: ./hooks/hooks.json resolves
to already-loaded file ...\hooks\hooks.json. The standard hooks/hooks.json is
loaded automatically, so manifest.hooks should only reference additional...

Confirmed via a clean, isolated install from this repo's current main
(45bbf22816d2f1e98e44d2c0a0e34f9799ed7539): the plugin installs but fails to
load.

Background

This exact fix was already made and merged into a local working copy of this
repository during an earlier hardening pass, but never reached this
repository — so the fix effectively regressed the moment anyone did a fresh
install rather than reusing that already-patched local checkout. This PR
publishes that fix for real.

Change

One line removed, nothing else:

   "author": {
     "name": "Nextbridge"
   },
-  "hooks": "./hooks/hooks.json",
   "license": "MIT",

Verification

• .claude-plugin/plugin.json still parses as valid JSON.
• git diff --check clean (no whitespace errors).
• git diff --stat confirms exactly one file, one deleted line — no version
  bump, no lockfile change, no other file touched (version bumping is left to
  release-please, per this repo's existing convention).