chore: release v0.13.2

[edwin-zvs]

Summary

• Bump workspace version from 0.13.1 → 0.13.2 for the next patch release.
• Updates Cargo.lock package versions accordingly.

Release notes (since v0.13.1)

• tui: C-1 focuses the session list; request keyboard disambiguation (tui: C-1 focuses the session list; request keyboard disambiguation #771)
• tui: highlight the subagents marker with hover and selection (tui: highlight the subagents marker with hover and selection #772)
• Dismiss Help before underlying input (Dismiss Help before underlying input #770)
• feat: unify fork harness selection (Unify fork harness selection #769)
• native subagents: backfill full child history into mirrors (native subagents: backfill full child history into mirrors #767)
• tui: collapse subagent groups in the lineage view behind a toggle (tui: collapse subagent groups in the lineage view behind a toggle #768)
• fix: archive terminal native subagents (Archive terminal native subagents automatically #766)
• tui: fix lineage wheel scrolling — free-roaming viewport, hscrollbar row (tui: fix lineage wheel scrolling — free-roaming viewport, hscrollbar row #765)

Test plan

• cargo build succeeds after version bump
• After merge: tag v0.13.2 and push to trigger release workflow
• Verify GitHub Release assets publish successfully