Track GitHub Copilot CLI 1.0.68 upstream release

[a5c-ai]

Upstream version update: GitHub Copilot CLI

• Previous graph version: 1.0.67
• Latest upstream version: 1.0.68
• Package checked: @github/copilot
• Install method/package: unchanged; Copilot CLI remains the GitHub Copilot CLI/extension surface

Sources read:

• Release notes: https://github.com/github/copilot-cli/releases/tag/v1.0.68
• npm latest check: npm view @github/copilot@latest version returned 1.0.68

Research summary:
The v1.0.68 release notes add Kimi K2.7 Code support, agents-screen session browse/resume/switch, plan budget details in the statusline and /usage, clearer transient IDE disconnect behavior, slash-command alias completion, sandbox filesystem-policy hardening, symlink conflict rejection, nested subagent tool-filter preservation, and multibyte /diagnose preservation.

Likely system impact:

• Model catalog should include/recognize Kimi K2.7 Code for Copilot CLI.
• Usage parsers may need to handle plan budget details in statusline and /usage.
• IDE bridge should model transient disconnects as recoverable clear-error states rather than permanent tool removal.
• Sandbox policy modeling should account for edit/patch confinement and symlink conflict rejection.
• Subagent launch metadata should preserve custom-agent tool filters in nested subagents.

Migration notes:
No package/install migration was published.

Assimilation checklist:

• Update Copilot model catalog: add/confirm kimi-k2.7-code support.
• Update usage parser expectations for plan budget details in statusline and /usage.
• Update IDE bridge notes: transient IDE disconnects keep tools listed but return clear disconnected errors.
• Update sandbox policy notes: reject patch/file edits outside policy and symlink-list conflicts.
• Update nested subagent metadata: custom-agent tool filters are preserved.

[a5c-ai]

Duplicate of #1110. See that issue for tracking.