CoreAI v6.2.1

CoreAI v6.2.1 — patch over v6.2.0. Restores the CI package-lockstep gate (internal com.neoxider.* dependency pins were left at 6.0.0 while packages were 6.2.0), adds a one-command lockstep version-bump script, and lands a root-README accuracy audit.

Fixed

• Package lockstep restored: the 6.0→6.2 version bumps advanced each package's version but left the
  internal com.neoxider.* dependency pins at 6.0.0, so the CI "Package graph (lockstep + deps)" gate
  failed with 11 mismatches. All six packages now pin the shared version. (supersedes the v6.2.0 tag,
  whose published package.json files still carried the stale 6.0.0 pins)

Added

• tools/bump_version.py — one command bumps every Assets/*/package.json version and every
  internal com.neoxider.* dependency pin to a target version in lockstep, then self-verifies with the
  same rule the CI gate enforces (python tools/bump_version.py 6.2.1, or --check to verify only).

Docs

• Root README audit: corrected the package count (six, including the new CoreAI MCP Server
  package), fixed a wrong tool class name (WorldCommandTool → WorldLlmTool / world_command), and
  reflected the 6.2.0 features (mod runtime self-heal, vision Detect self-probe, Hub sub-tabs).

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Full changelog: Assets/CoreAI/CHANGELOG.md