feat: add a torch to the starting home

[dmccoystephenson]

Summary

• Follow-up to the new-world starting home (Generate starting home and grant starting items on new world #491). The home (Oak Wood walls, wood floor, doorway, bed, chest) had no light source — this adds a torch inside it.
• StartingHomeGenerator.generate now places a Torch on the bottom-left interior corner (left+1, bottom-1). The bed and chest occupy the two top corners, so the torch corner is free / collision-free.
• Torch is already registered in roomJsonReaderWriter.py, so the home (torch included) persists across save/reload.

Test plan

• python3 -m compileall src -q clean
• SDL_VIDEODRIVER=dummy SDL_AUDIODRIVER=dummy python3 -m pytest → 930 passed (was 929; +1)
• New test_torch_is_placed_on_a_free_interior_corner asserts the torch at (6,10) in a 17×17 room and no collision with bed/chest
• black clean on changed files

Closes #492

🤖 Generated with Claude Code

[dmccoystephenson]

Self-review rubric (reviewed by Claude; CI green on head):

• Scope: PASS — only startingHomeGenerator.py, its test, and CHANGELOG.md changed; all serve Add a torch to the starting home #492.
• Tests-new: PASS — test_torch_is_placed_on_a_free_interior_corner exercises the new placement and asserts no bed/chest collision.
• Tests-fix: N/A — feature addition, not a bug fix.
• Sibling structure: PASS — new test mirrors the existing furniture/floor tests in the same file.
• Docs: PASS — CHANGELOG.md updated (summary row + dated AI-session entry); no other doc source references home contents.
• Issue resolution: PASS — Add a torch to the starting home #492's named surface (StartingHomeGenerator.generate, torch placement, persistence, test) is changed.
• CI: PASS — package, package-macos, test, windows-installer all green on the head SHA.
• No @Property / no new print() / no container import in class files: PASS — grep of added lines returns none.
• DI discipline: PASS — no DI-managed construction touched.
• Vendored lib untouched: PASS — no src/lib/ files in the diff.
• Markdown fences: PASS — CHANGELOG entries use inline backticks only, no triple-backtick blocks.
• Schema sync: N/A — no JsonReaderWriter serialization changed (Torch was already registered).

Note: the box's python is Python 2.7; tests were run with python3 (matches CI/CLAUDE.md). Filed as a dev-loop learning-log note.