chore: release 3.8.0

[joshuawheelock]

[3.8.0] - 2026-06-09

Added

• TUI package update notification: Bare jumbo launches now check the published npm package version in the background and show an update notification in the TUI drawer when a newer version is available, including safe npm self-upgrade handling and manual update guidance when needed.
• TUI update preview controls: Developers can locally preview CLI update availability, in-progress, success, and manual-action states with JUMBO_CLI_UPDATE_TEST_MODE, JUMBO_CLI_UPDATE_TEST_VERSION, JUMBO_CLI_UPDATE_TEST_UPGRADE_DELAY_MS, and JUMBO_CLI_UPDATE_TEST_UPGRADE_RESULT.

Changed

• TUI package update notification: The update-in-progress notification now includes a rotating Braille glyph that cycles through the letters in updating.

Fixed

• CLI update diagnostics: npm self-upgrade feasibility failures now log operation, invocation mode, error message, error code, and bounded npm stdio tails instead of only the error type.