fix(opencode): bump opencode-goal-plugin pin to 0.7.0 for the goal bridge (#2753)

* fix(opencode): bump opencode-goal-plugin pin to 0.7.0 for the goal bridge

The 0.6.6-0.7.0 line adds per-session state sharding, same-session
multi-process lease safety, deterministic /goal command handling, and
lifecycle status visibility while preserving the GoalPlugin(context,
{auditor}) contract, all 11 goal tools, and the no_active_goal error
code the LoopX goal bridge relies on.

Verified the bridge API surface (factory signature, auditor option,
hooks, error codes) is unchanged against the 0.7.0 tarball; the pinned
@opencode-ai/plugin range is retained because loopx-goal.js imports its
tool helper.

* fix(opencode): keep install-local.sh bridge comment pinned to 0.7.0

The goal-bridge pin was bumped to opencode-goal-plugin@0.7.0 in the
slash-command installer and its tests, but the install-local.sh comment
still referenced 0.6.5. Align the comment with the pinned dependency.