chore(main): release 0.16.0

[github-actions]

🤖 I have created a release beep boop

0.16.0 (2026-06-23)

Features

• configurable design-spec save location with arc-owned frontmatter (a96b01f)
• config: validate plans.dir and add 'config get --resolved' (c2a0301)
• jjfs: implement .jj detection, workspace mapping, and git backend lookup (35e8099)
• plans: add config, dir templating, and frontmatter foundation (c2293a0)
• plan: write spec frontmatter on create, sync status on approve (09c335a)
• storage: drop share/paste tables via migration 018 (c7f8530)
• vcs: add jjfs + vcs foundation skeletons and contract tests (271e1a6)
• vcs: implement git/jj dispatcher for main-repo and remote detection (72b6cef)
• vcs: native jj (Jujutsu) support for .jj-only repos (4c2222b)
• vcs: native jj support — design + impl (d302f43)
• vcs: native jj support — design + impl (e3cc36f)
• vcs: route resolver and remote detection through the vcs dispatcher (ffd8e0f)
• vcs: surface detected VCS in arc which --json (d54b1c7)
• vcs: surface detected VCS in arc which --json (c396a8a)

Bug Fixes

• plans: harden frontmatter parsing for delimiters, EOF, and CRLF (7ee2967)

Refactoring

• api,cli: remove share/paste endpoints, CLI, wiring, and orphaned sharesconfig (19691f4)
• api: drop ShareConfig from OpenAPI config schema (97423a5)
• config: remove share config schema (73b7739)
• config: reuse templateVarRe, harden getwd + --resolved guard (fe5cbd8)
• plan: warn on read errors, match stderr idiom, expand deriveTitle tests (bb0d9ce)
• remove arc-paste standalone service (ad45a57)
• storage,types: remove share/paste storage layer and paste engine (6fbb323)
• vcs: address slop-review findings (2d87cd7)
• web: remove share/paste UI stack (be17c32)
• web: remove vitest test infra (arc-paste artifact) (e3378b9)

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