chore: prepare release v0.21.0

[Microck]

what changed

• bump the crate and npm wrapper to 0.21.0
• move the assistant v2 notes under the exact changelog heading used by the release workflow
• update the docs version marker

why

this is the release prep for the breaking assistant output changes in #196. the release workflow reads ## [0.21.0] exactly.

verification

• cargo fmt --check
• cargo clippy --all-targets --all-features -- -D warnings
• cargo test --workspace --all-targets --locked
• cargo check --workspace --all-targets --locked
• cargo audit (one allowed event-listener warning remains)
• npm pack --dry-run

release prep drafted and verified with Hermes Agent (gpt-6-luna). no package was published.

Summary by CodeRabbit

• Release
  • Updated the CLI version to 0.21.0.
• Documentation
  • Updated the documentation’s last-updated notice to October 2026 and CLI v0.21.0.
  • Clarified that --model cannot be used with a built-in assistant, which uses its own model.

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Project	Deployment	Actions	Updated
docs	Ready	Preview	Oct 8, 2026 8:06pm UTC

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-08T20:07:10.640995Z	07d7982	New commits

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ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: Repository: Microck/kagi-cli/.coderabbit.yaml
• Review profile: CHILL
• Plan: Advanced
• Run ID: 25b0de81-98cb-4d1e-884a-bf42a440a1cb

📥 Commits

Reviewing files that changed from the base of the PR and between 2a2cdfc and 07d7982.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (1)

• docs/content/docs/commands/assistant.mdx

Included review availability: This review used your included allowance. Your plan provides up to 2 included reviews per hour; 0 remain after this review.

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📝 Walkthrough

Walkthrough

The Cargo and npm package versions change to 0.21.0. The changelog and documentation update notice reflect the release. The assistant command documentation clarifies that --model cannot be combined with a built-in --assistant.

Changes

0.21.0 Release Metadata

Layer / File(s)	Summary
Release version alignment Cargo.toml, npm/package.json, CHANGELOG.md, docs/content/docs/index.mdx	The Cargo and npm package versions change to 0.21.0. The changelog gains a 0.21.0 heading, and the documentation update notice identifies October 2026 and CLI v0.21.0.

Assistant Option Documentation

Layer / File(s)	Summary
Document the model option constraint docs/content/docs/commands/assistant.mdx	The --model description states that it cannot be combined with a built-in --assistant, which uses its own model.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Other

Suggested reviewers: joilence

Merge Risk: ⚪ Minimal · up to 07d79

The 0.21.0 release metadata is consistent, and the CLI behavior matches the assistant option documentation. No merge-blocking risk is identified.

🚥 Pre-merge checks | ✅ 6

✅ Passed checks (6 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the primary change: preparation of the v0.21.0 release.
Description check	✅ Passed	The description explains what changed, why it changed, and lists verification steps. It omits the template's Docs and Auth / Secrets sections and does not use the template's exact section headings, bu…
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Release Metadata Consistency	✅ Passed	All required release metadata matches. Cargo.toml declares kagi version 0.21.0, the kagi package entry in Cargo.lock declares 0.21.0, and npm/package.json declares 0.21.0. `CHANGELOG.m…

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at @docs/content/docs/index.mdx:
- Line 262: Update the `--model` documentation to state that it cannot be
combined with `--assistant <built-in>` because built-in assistants use their own
model; retain the existing single-prompt override description.

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ℹ️ Review info

⚙️ Run configuration

• Configuration used: Repository: Microck/kagi-cli/.coderabbit.yaml
• Review profile: CHILL
• Plan: Advanced
• Run ID: 804c34bf-bede-4034-a83b-65e290f5f0bf

📥 Commits

Reviewing files that changed from the base of the PR and between 97092bc and 2a2cdfc.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (4)

• CHANGELOG.md
• Cargo.toml
• docs/content/docs/index.mdx
• npm/package.json

Included review availability: This review used your included allowance. Your plan provides up to 2 included reviews per hour; 1 remain after this review.