docs(01-01): complete core.py + mlb.py plan

Tasks completed: 2/2
- Create core.py shared module
- Create mlb.py sport module

SUMMARY: .planning/phases/01-script-architecture/01-01-SUMMARY.md

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.planning/STATE.md

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+# Project State
+
+## Project Reference
+
+See: .planning/PROJECT.md (updated 2026-01-09)
+
+**Core value:** Every game must correctly link to its teams and stadium — a game at the wrong venue or with broken team links ruins trip planning.
+**Current focus:** Phase 1 — Script Architecture
+
+## Current Position
+
+Phase: 1 of 6 (Script Architecture)
+Plan: 1 of 3 in current phase
+Status: In progress
+Last activity: 2026-01-10 — Completed 01-01-PLAN.md
+
+Progress: █░░░░░░░░░ 10%
+
+## Performance Metrics
+
+**Velocity:**
+- Total plans completed: 1
+- Average duration: 5 min
+- Total execution time: 5 min
+
+**By Phase:**
+
+| Phase | Plans | Total | Avg/Plan |
+|-------|-------|-------|----------|
+| 1. Script Architecture | 1/3 | 5 min | 5 min |
+
+**Recent Trend:**
+- Last 5 plans: 01-01 (5 min)
+- Trend: —
+
+## Accumulated Context
+
+### Decisions
+
+Decisions are logged in PROJECT.md Key Decisions table.
+Recent decisions affecting current work:
+
+- **01-01**: Each sport module has its own `get_{sport}_team_abbrev()` function for independence
+- **01-01**: Import fallback pattern (try/except) for running from Scripts/ or project root
+
+### Deferred Issues
+
+None yet.
+
+### Blockers/Concerns
+
+None yet.
+
+## Session Continuity
+
+Last session: 2026-01-10
+Stopped at: Completed 01-01-PLAN.md
+Resume file: None