fix(gitea): make gitea-releases executable and correct misleading domain claims

gitea-releases was the weakest skill in the plugin: no allowed-tools, no
owner/repo resolution, and a checkbox list where a dispatch table belongs, so
an agent reaching it had to guess both its permissions and its inputs. The
id-vs-tag_name trap — deleting by tag name where the API wants the numeric id —
is restored as an explicit Gotcha because it destroys the wrong release
silently.

Elsewhere the `exclusive` flag was documented on the wrong side of the
read/write split, and label data from one instance was presented as though it
were universal, which invites an agent to assume a taxonomy that does not
exist on the target repo. rename_branch was missing from the branch surface.
Reference prose and fences are cleaned up in passing.

plugins/gitea/skills/gitea-releases/references/sources.md

@@ -3,7 +3,7 @@
 ## gitea-mcp-repo
 
 - **URL:** https://gitea.com/gitea/gitea-mcp
-- **Description:** Official gitea-mcp repository (v1.3.0); operation/*.go source files documenting all 55 MCP tools, their parameters, and CLI flags.
+- **Description:** Official gitea-mcp repository; operation/*.go source files documenting the MCP tools, their parameters, and CLI flags. Originally extracted at v1.3.0; the input parameter schemas in `references/call-signatures.md` were re-verified live via `ToolSearch` against the deployed server, **last verified at v1.7.0** as reported by `get_gitea_mcp_server_version`.
 - **Research doc:** plugins/gitea/docs/research/docs/gitea/api-reference.md (Releases and Tags section); plugins/gitea/docs/research/docs/gitea/troubleshooting.md (`delete_release` numeric-id gotcha, `per_page` defaults)
 
 **Contributing files:**