fix: remove stale MetricFlow semantic_models.yml files left after Fusion migration (#103)

* feat: add MetricFlow semantic layer for financial and economic metrics (#85)

Implements phase 1 of the dbt semantic layer across four domains:

- markets/semantic_models.yml: S&P 500, sector, currency, fixed income daily prices
- commodities/semantic_models.yml: input, energy, and agriculture commodity prices
- government/semantic_models.yml: FRED monthly economic indicators
- signals/semantic_models.yml: inflation (CPI/PCE/breakeven) and labor market signals

metrics.yml defines 35 metrics covering equity returns, volatility, inflation
gauges (CPI YoY, core PCE, breakeven spreads), and labor market indicators
(Sahm Rule, JO/unemployed ratio, quits rate).

saved_queries.yml provides 6 pre-built agent queries for equity performance,
sector rotation, inflation dashboard, labor market dashboard, macro series scan,
and commodity prices.

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

* fix: remove stale semantic_models.yml and MetricFlow files superseded by Fusion migration

The merge from main (#102) deleted these files in favor of the Fusion
schema.yml approach, but the merge kept our branch versions due to
diverging history. Manually aligning with main's state.

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

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Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: C00ldudeNoonan