fix(tui): keep retry attempt before message

[kitlangton]

Summary

• format retrying subagent detail rows as Retrying (attempt N) · message instead of trailing bracketed metadata
• keep retry state and attempt count readable when a long message wraps at narrow terminal widths
• add focused formatting coverage for retry details

Rendering

Before:

↳ Rate limited by provider; retrying after quota window [
  retrying attempt #2]

After:

↳ Retrying (attempt 2) · Rate limited by provider; retrying
  after quota window

Stack

• Builds on merged fix(tui): keep background marker with subagent label #30271, which places the background marker beside the subagent identity.
• feat(tui): add internal debug frames #30269 is stacked above this PR and supplies the internal debug-frame harness used for narrow-width real-TUI verification.

Verification

• git diff --check
• bun run test -- test/cli/tui/inline-tool-wrap-snapshot.test.tsx test/cli/tui/debug-frame.test.ts on stacked child feat(tui): add internal debug frames #30269 (14 pass, 6 snapshots)
• bun typecheck from packages/opencode on stacked child feat(tui): add internal debug frames #30269
• pre-push bun turbo typecheck passed while rebasing/pushing feat(tui): add internal debug frames #30269 above this updated PR
• live real-TUI debug-frame render confirms Retrying (attempt 2) · stays ahead of the wrapping message

Scoped oxlint remains blocked by the existing malformed .oxlintrc.json configuration on the base branch.