chore: revert manual CHANGELOG and version bumps (release-please owns them)

Both CHANGELOG.md and plugin.json version are auto-managed by
release-please for plugins/* (see release-please-config.json
extra-files: [{ jsonpath: "$.version" }] and existing release
PRs #158/#160/#163). Manual edits race with the next release PR.

Skill relocations and the plugin.json `skills` array change remain
intact — they're the actual fix release-please will pick up via the
fix(...) commits already on this branch.

Author: amondnet

plugins/better-auth/.claude-plugin/plugin.json

@@ -1,6 +1,6 @@
 {
   "name": "better-auth",
-  "version": "1.2.1",
+  "version": "1.2.0",
   "description": "Better Auth authentication framework skills for JavaScript/TypeScript projects",
   "author": {
     "name": "Better Auth",

plugins/better-auth/CHANGELOG.md

@@ -1,12 +1,5 @@
 # Changelog
 
-## [1.2.1] - 2026-04-29
-
-
-### Bug Fixes
-
-* **better-auth:** move hand-written `use-better-auth` skill from `.agents/skills/` to `skills/` per repo convention. `.agents/skills/` is reserved for vendor-managed skills.sh-installed skills tracked in `skills-lock.json`. The `skills` field in `plugin.json` now uses array form `["./skills/", "./.agents/skills/"]` so both default and vendor paths load. No skill content changed.
-
 ## [1.2.0](https://github.com/pleaseai/claude-code-plugins/compare/better-auth-v1.1.0...better-auth-v1.2.0) (2026-04-23)
 
 

plugins/mastra/.claude-plugin/plugin.json

@@ -1,6 +1,6 @@
 {
   "name": "mastra",
-  "version": "1.3.1",
+  "version": "1.3.0",
   "description": "Official agent skills for coding agents working with the Mastra AI framework",
   "author": {
     "name": "Mastra AI",

plugins/mastra/CHANGELOG.md

@@ -1,12 +1,5 @@
 # Changelog
 
-## [1.3.1] - 2026-04-29
-
-
-### Bug Fixes
-
-* **mastra:** move hand-written `use-mastra` skill from `.agents/skills/` to `skills/` per repo convention. `.agents/skills/` is reserved for vendor-managed skills.sh-installed skills tracked in `skills-lock.json`. The `skills` field in `plugin.json` now uses array form `["./skills/", "./.agents/skills/"]` so both default and vendor paths load. No skill content changed.
-
 ## [1.3.0](https://github.com/pleaseai/claude-code-plugins/compare/mastra-v1.2.0...mastra-v1.3.0) (2026-04-23)