…t compiler fixtures

…el strings

Replace 8 model/provider fields with 2 tiers (fast/strong) using
"provider/model" format strings. Add parse_model_string(), v1 config
auto-migration, legacy env var backward compat, and CustomProviderConfig
for third-party endpoints. Remove unused DefaultsConfig (db_path,
population_size).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

…claude→anthropic

Add OpenAICompatProvider for third-party endpoints (OpenRouter, DeepSeek,
Together, Groq) using Chat Completions API with json_schema response
format. Build lazy-import provider registry in __init__.py. Rename
ClaudeProvider→AnthropicProvider (keep alias). Update base.py to 2-tier
abstract properties (default_fast_model, default_strong_model).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

…timator

Update llm.py for fast/strong routing via provider/model strings. Add
pricing and rate limit entries for new providers (OpenRouter, DeepSeek,
Together, Groq). Update DualRateLimiter for mixed-provider support.
Rename engine.py and estimator.py params from model/pivotal_model/
routine_model to strong/fast. Add backward compat properties on
SimulationRunConfig.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

…lags

Replace --model/--pivotal-model/--routine-model with --strong/--fast.
Rewrite config show/set for new keys (models.fast, models.strong,
simulation.fast, simulation.strong, providers.*). Update tests for
new abstract method names and parameter changes.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

- Create extropy/core/cost/ package (pricing.py, tracker.py, ledger.py)
  with three-tier pricing resolution (OpenRouter API → cache → fallback),
  session-scoped CostTracker singleton, and SQLite cost ledger
- All models use Pydantic BaseModel (ModelPricing, CallRecord, ModelUsage,
  CostEntry, TokenUsage)
- Wire _record_usage() hook into LLMProvider base class
- Extract + record token usage from all OpenAI and Anthropic provider
  methods (simple_call, reasoning_call, agentic_research, simple_call_async)
- Add --cost CLI flag and defaults.show_cost config option for cost footer
- Add atexit hook to print cost summary and persist to ledger
- Includes ruff format/lint fixes across codebase

Co-authored-by: Cursor <cursoragent@cursor.com>

Drop PipelineConfig, SimZoneConfig, v1→v2 migration, legacy env var
handling, get_api_key(), and get_azure_config(). Pure Pydantic models
with no backward-compat cruft. ~200 lines removed.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Merge cost-tracking branch which adds:
- extropy/core/cost/ package (pricing, tracker, ledger)
- Provider usage recording (OpenAI + Anthropic)
- --cost CLI flag + defaults.show_cost config option
- DefaultsConfig with show_cost, population_size, db_path

All conflicts resolved: kept config-provider-redesign's Pydantic
refactor + legacy removal, layered cost-tracking additions on top.

Co-authored-by: Cursor <cursoragent@cursor.com>

Drop population_size and db_path (unused). Move show_cost to
ExtropyConfig directly. Config display only shows show_cost when enabled.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

…ith db-first network+sim changes