feat: add company primer research tab

feat: multi-provider LLM support, prominent chat, design pass, and new analytics

feat: Decision Stack redesign - 9 routes collapse into 4 (Verdict / Signals / Financials / Chat)

fix: harden portfolio_synthesis — content coercion, LLM singleton, typing cleanup

feat: add analytics/portfolio_synthesis — LLM portfolio outlook synthesis

fix: eliminate double AlphaVantage calls in compute_pulse; correct module docstring

feat: extend portfolio_exposure with scorecard, pulse, conviction, and catalyst aggregators

fix: clean up portfolio_exposure imports — plain get_brief import, remove unused Optional

feat: add portfolio_exposure — deterministic risk aggregation for Exposure Radar

deploy: Primer app for HF Spaces — clean orphan history