Performance improvements for the research graph & chat agents

[ggozad]

Changed

• Iterative Research Planning: Research graph now uses an iterative feedback loop instead of batch question processing
  • Planner proposes ONE question at a time, sees the answer, then decides whether to continue
  • Removes gather_context tool — planner proposes questions directly
  • Simpler flow: plan_next → search_one → loop back until complete → synthesize
  • Consolidated build_conversational_graph() into build_research_graph(output_mode="conversational")

[codecov]

Codecov Report

❌ Patch coverage is 93.75000% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.99%. Comparing base (5f6488e) to head (ac76ece).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
haiku_rag_slim/haiku/rag/agents/research/graph.py	92.59%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #267      +/-   ##
==========================================
- Coverage   84.03%   83.99%   -0.05%     
==========================================
  Files          71       71              
  Lines        4441     4360      -81     
==========================================
- Hits         3732     3662      -70     
+ Misses        709      698      -11     

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