v6.12.0

Added

• branch-stack skill: read, link, extend, sync and tidy a GitHub stack without opening or landing a PR. Actions are status, link, add, sync and tidy; opening a layer stays with pr-create and landing one with pr-land.
• stack-status.py reports a verdict for each branch (linked, chained-unlinked, independent or no-pr), read from GitHub's stack field, the PR bases and local gh-stack tracking. Fork PRs are kept out of stack chains and local branch data.

Changed

• pr-create, pr-land, next-task-ship, branch-worktree, hud-worktrees and clod-role-git_manager detect a stack with stack-status.py instead of guessing from a PR's base branch.
• library/references/stacked-prs.md covers the rebase model, stale local tracking and one worktree per stack.
• CLAUDE.md §1 brought up to date with the git record: Python moves from Learning to Proficient, GDScript is listed as Dabbled, FastAPI joins the backend table, pgvector and the MongoDB work are noted, the testing section lists the runners and practices actually in use, and deployment gains Docker Compose, Cloudflare tunnel and Colima.
• CLAUDE.md keeps its section numbers but moves reference detail (§1, plus the long tails of 7.5, 7.6, 8.2, 8.7 and 8.8) into library/references/.
• project-context-loader and task-sync agents run on haiku.
• The repo is licensed under zlib, with the licence scoped to the marketplace plugins.
• .gitignore is an allowlist: root entries are ignored unless named. scratch/, output/, .claude/ and settings.local.jsonc are no longer tracked.
• The customisation guide moved to docs/guides/ and the wiki index drops its dead links.