chore: release v1.6.0

[github-actions]

🤖 New release

• kono-wt: 1.5.0 -> 1.6.0

Changelog

1.6.0 - 2026-08-31

Added

• (cli) complete issue numbers and route wt issue in the shell wrappers
• (cli) add wt issue to create an issue-linked worktree
• (agent) bound a generation run with a deadline
• (config) add the [agent.generation] profile
• (model) record a linked GitHub issue on worktree rows
• (gh) read GitHub issues through the gh client
• (create) opt-in copy-on-write materialization of new worktrees
• (submodules) seed new worktrees from local object stores
• locked wt.* metadata writes on the Workspace API
• wt.schema version and repo advisory lock
• gate CLI and TUI behind cargo features
• stateless worktree service API

Fixed

• (worktree) validate wt.schema under the repo lock
• (worktree) export SubmoduleSeeding and seal RemovedWorktree
• (agent) return promptly when a killed agent leaves a grandchild
• (create) derive the preview and the real target from one rule
• (create) leave the source's untracked files out of a reflink clone
• (remove) keep git's untracked guard when forcing past submodules
• (submodules) reject traversal in .gitmodules names and paths
• (create) restore submodule origins after a reflink attach
• (create) decide the reflink tree check against the real worktree
• (git) detect submodules recursively and allow removing their worktrees
• take the advisory repo lock on every mutating command path

Other

• document using wt as a library
• (lib) document the embedding surface in rustdoc
• document wt issue and the agent.generation profile
• merge origin/master into feat/fast-submodule-worktrees
• explain submodule seeding and reflink materialization
• (copy) stop the copy walk at nested repositories
• extract branch naming into a pure wt::naming module
• align gix to 0.85 to match karet

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