chore(main): release 0.21.0

[krisarmstrong]

🤖 I have created a release beep boop

0.21.0 (2026-05-28)

Features

• ui: canonical shell — modernize Sidebar + PageHeader (Phase 1) (#339) (3983689)

Bug Fixes

• ci: unblock main — race in sse, lighthouse cert, e2e selectors (#345) (533f7f8)
• ci: unblock stem main — PageHeader testid, E2E selector, robots.txt (#347) (6a5de95)

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[github-actions]

License Compliance Report

All dependencies pass license compliance checks

Go Dependencies

• Unknown: 31 package(s)
• MIT: 26 package(s)
• BSD-3-Clause: 16 package(s)
• Apache-2.0: 11 package(s)
• BSD-2-Clause: 1 package(s)

npm Dependencies

See full report in workflow artifacts

Allowed Licenses: MIT, Apache-2.0, BSD-*, ISC, CC0-1.0, MPL-2.0
Forbidden: GPL, AGPL, SSPL (strong copyleft)

[github-actions]

License Compliance Report

All dependencies pass license compliance checks

Go Dependencies

• Unknown: 31 package(s)
• MIT: 26 package(s)
• BSD-3-Clause: 16 package(s)
• Apache-2.0: 11 package(s)
• BSD-2-Clause: 1 package(s)

npm Dependencies

See full report in workflow artifacts

Allowed Licenses: MIT, Apache-2.0, BSD-*, ISC, CC0-1.0, MPL-2.0
Forbidden: GPL, AGPL, SSPL (strong copyleft)

[krisarmstrong]

🤖 Created releases:

• v0.21.0

🌻