brclient: JSON parse failures with br >= 0.1.38 wrapped response format

[deokcf]

Summary

atari's brclient fails to parse JSON responses from br >= 0.1.38 in at least two places:

1. br epic close-eligible - atari expects []brclient.EpicCloseResult (array) but br returns a wrapped object ({"issues": [...], ...}).
2. br show <id> - enrichment calls fail with exit status 3 when the bead is in_progress, causing a spam loop of failed to enrich bead warnings every ~5 seconds in the debug log.

These failures prevent atari from:

• Closing beads after a successful session ("session and follow-up both failed to close bead")
• Closing eligible epics (infinite retry loop in idle state)
• Enriching bead data for TUI display

Versions

• br: 0.1.38 (latest as of 2026-04-12)
• atari: dev @ 9fed7677 (latest main as of 2026-04-12)
• The Handle wrapped JSON format in brclient List and Ready fix (PR Fix br list --json format change in beads_rust 0.1.37 #2, commit 78f1d583) addressed List and Ready but the same wrapping issue affects other endpoints.

Reproduction

# Start atari against a workspace with beads
cd /path/to/workspace && atari start --tui

# Debug log fills with:
# WARN failed to close eligible epics: parse br epic close-eligible output: json: cannot unmarshal object into Go value of type []brclient.EpicCloseResult
# WARN failed to enrich bead, using basic data: br show <id> failed: exit status 3

Impact

• Beads complete successfully but cannot be closed by atari, requiring manual br close intervention
• The epic close-eligible retry loop runs every ~5 seconds indefinitely when atari is idle
• TUI shows "no active bead" even when a session is running (enrichment failures)

Suggested Fix

Audit all brclient JSON parsing to handle both the legacy array format and the new wrapped object format ({"issues": [...], "total": N, ...}) that br 0.1.38 returns. The same unwrapping logic from PR #2 likely needs to be applied to:

• EpicCloseEligible()
• Show()
• Any other brclient method that parses br JSON output