chore(release): 0.1.21

[CarmenDou]

What

Release 0.1.21. It ships what merged since 0.1.20:

• feat(template): author and publish community templates from the CLI #355: agents and people author community templates from the CLI. insta template drafts, draft, create (from a project, or --blank), edit --patch, regenerate, publish, unpublish and delete, with an editor link for each draft.

The platform side of #355 (InsForge/instacloud-platform#634) is in production since the deploy of main 891d8ab8 on 2026-10-07.

How

package.json and package-lock.json go from 0.1.20 to 0.1.21, the same two files as #354. After this merges, the tag v0.1.21 on the merge commit runs release.yml, which builds the binaries and publishes npm.

Verify

• CI on this PR.
• After the tag: the GitHub Release carries the five binaries and SHA256SUMS, and npm view insta version answers 0.1.21.

🤖 Generated with Claude Code

---

Summary by cubic

Bumps insta from 0.1.20 to 0.1.21. This release ships CLI support for agents and people to author community templates — insta template drafts, draft, create (from a project or --blank), edit --patch, regenerate, publish, unpublish, and delete, each with an editor link. The platform side is already live since the 2026-10-07 main deploy. Merging this creates tag v0.1.21, which triggers release.yml to build the binaries and publish to npm.

^{Written for commit 10a8f9f. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 2 files

_{View guided diff | Turn on auto-fix | Re-trigger cubic}

[jwfing]

LGTM - approved.