extend renderAgentTree to support multi-level agent subtree rendering (#557)

[JeremyDev87]

Summary

Closes #557

Extends renderAgentTree in activity-visualizer.pure.ts to render agent delegation chains beyond depth 1. Previously, grandchild nodes (depth ≥ 2) were silently omitted; this PR introduces a recursive renderSubtree helper that traverses the full agent tree.

Problem

Before:
● main-agent               ← depth 0
  ├ ● solution-architect   ← depth 1 ✓
  └ ● researcher           ← depth 1 ✓
  # solution-architect → code-reviewer (depth 2) ✗ missing

Solution

After:
● main-agent               ← depth 0
  ├ ● solution-architect   ← depth 1
  │   └ ● code-reviewer   ← depth 2 ✓
  └ ● researcher           ← depth 1
  ◉ brainstorming (skill)  ← skill leaf

Changes

• activity-visualizer.pure.ts: Replace flat depth-1 loop with recursive renderSubtree function

  • Cycle detection via visited Set prevents infinite loops in cyclic graphs
  • Prefix string accumulates per depth level (' ' or '│ ') for correct tree connectors
  • Height limit checked at every recursion level to respect panel bounds
  • Skill leaf nodes rendered after all agent subtrees (unchanged behavior)
  • Removed now-unused AgentChild, SkillChild, TreeChild local types

• activity-visualizer.pure.spec.ts: Added test cases covering

  • Grandchild rendering (depth 2)
  • Tree connector correctness (├/└/│) for mixed sibling+child structures
  • Height limit truncation mid-subtree
  • Cycle detection (no infinite loop, no duplicate lines)

Test Plan

• Existing tests pass
• depth=2 grandchild nodes appear with correct │ continuation prefix
• Height limit stops rendering without crash
• Cyclic agent graph does not loop infinitely

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Project	Deployment	Actions	Updated (UTC)
codingbuddy-landing	Ready	Preview, Comment	Feb 19, 2026 0:55am