NSCT Agent 6e2e7386ad stage20: context budgeting - per-stage token limits (planner 12k, claim 16k, contradiction 24k, synthesis 48k) ...

Implemented:
- context_budget.py: ContextBudgetConfig (Pydantic, frozen) mit 4 Stage-Limits,
  validation (ge/le), get_limit(), total_max_tokens, stage_keys
- context_budget.py: ContextBudgetTracker mit track_tokens(), get_usage(),
  is_exhausted(), reset_stage(), reset_all(), total_usage, elapsed_seconds
- context_budget.py: ContextBudgetExhaustedError mit stage_name, used_tokens, limit_tokens
- orchestrator.py: _track_context_tokens() Methode, context_budget_config/tracker init
- orchestrator.py: context_budget_tracker property export
- __init__.py: exports ContextBudgetConfig, ContextBudgetExhaustedError, ContextBudgetTracker
- priority_queue.py: __aenter__/__aexit__ auf async geandert (Testfix)
- test_context_budget.py: 28 Tests (DefaultConfig, TrackAccumulation, ExhaustedError,
  GetUsage, Reset, IsExhausted, InvalidStageNames, InvalidTokens)
- test_context_budget_integration.py: 6 Tests (Orchestrator-Integration)
- HANDOFF.md: Stage 20 abgeschlossen dokumentiert

Tests: 34 passed (28 unit + 6 integration) + 14 performance = 48 total

2026-08-29 08:57:18 +00:00

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