Launch Waterboy production sports simulation engine

[Chris-ObtuseAI]

What changed

• Rebrands the product, primary CLI, API, package distribution, documentation,
  container examples, and showcase UI as Waterboy while retaining
  sports-engine and universal_sports_engine compatibility.
• Adds a query-only Dummy historical importer, bounded public scoreboard pipeline,
  provenance SQLite store, recency/opponent-adjusted projection model, current-week
  service, and hypothetical matchup simulations.
• Adds the versioned FastAPI surface and responsive seven-league dashboard for MLB,
  NFL, NCAAF, NBA, WNBA/WBA, NCAAM, and NHL.
• Displays projected scores and totals with one decimal place and an accessible
  check mark beside the higher-probability team.
• Rewrites the landing page and README as an evidence-backed product showcase with
  architecture and governance diagrams plus a tracked validated screenshot.
• Adds a non-root container, production runbook, data lineage, limitations, and
  version 0.4 release evidence.

Why

The repository previously exposed a strong deterministic simulation kernel but
lacked a production data path, current-week projection surface, hypothetical
matchup workflow, cohesive UI, and public product identity. Waterboy connects
those pieces without weakening deterministic replay or evidence boundaries.

Safety and data boundary

• Dummy is opened only through SQLite mode=ro with PRAGMA query_only=ON.
• No Dummy source, process, configuration, or runtime is modified or interrupted.
• No wagering, brokerage, order, or capital-execution behavior is added.
• Current forecasts remain explicitly provisional pending prospective
  point-in-time calibration evidence.

Validation

• Ruff: PASS
• Strict mypy: PASS across 43 source files
• Pytest: 74 passed, zero warnings
• README link validation: PASS
• JavaScript syntax and git diff --check: PASS
• Desktop and mobile browser validation: PASS
• Matchup Lab: PASS with decimal projections and projected-winner check
• Browser console: zero errors and zero warnings
• Isolated Waterboy wheel install: PASS
• New and legacy CLI/package aliases: PASS
• Seven of seven provisional league anchors: PASS
• 49 negative/mechanism controls: zero failures
• Docker build: not run because Docker is unavailable on the validation host