v0.1.5 — tag support & server-side branch tools

Tag support

• git_tag — list, create (annotated or lightweight), push, and remote (read origin's tags over the git transport).
• git_tag_verify — confirm origin really holds a tag after publishing it, by reading the remote rather than trusting the push's exit code.
• forge_tag_list / forge_tag_create — create the tag through the forge API, the reliable path when pushing refs/tags fails authentication.

Server-side branch management

• forge_branch_create / forge_branch_delete — create or remove a branch without a local work copy.

Changed

• The system-prompt section now states the connector is the default path for every git and forge operation.
• Tag creation is deliberately not gated by the force-push flags — tags are immutable release markers.

Fixed

• git_tag's tags field now always means tag records; a push reports targets under pushedNames.
• Tag names are validated with git check-ref-format instead of a hand-rolled pattern.