docs(level): document per-island death tracking in Level 2.29.0

[tastybento]

Documents the per-island death tracking that ships in Level 2.29.0 (BentoBoxWorld/Level#459).

Changes

docs/addons/Level/index.md

• deathpenalty note now says the island (not the player) loses block values, summarises the per-island rule, and links to the FAQ.
• sumteamdeaths note marked deprecated since 2.29.0 with an explanation of the one-time migration read.
• New FAQ entry "How does the death penalty work?" covering: what counts as a death on an island, team join/leave behaviour, reset/delete, the handicap formula, the admin report breakdown, a table of which game mode deaths settings still affect levels, the admin deaths commands, and the upgrade migration.
• New changelog entry for v2.29.0.

docs/BentoBox/Placeholders.md and data/placeholders.csv

• %[gamemode]_deaths% description clarifies it is BentoBox's own counter, not Level's per-island count.

Matching config-comment PRs are open in each game mode repo (AcidIsland #182, BSkyBlock #557, Boxed #134, Brix #3, CaveBlock #120, AOneBlock #562, Parkour #33, poseidon #18, SkyGrid #87).

Notes for review

• The changelog entry says Released: September 2026 because 2.29.0 is still a draft release. Please set the exact date when it goes out.
• mkdocs build passes locally.
• Should merge after Level 2.29.0 is published, since the FAQ describes it as current behaviour.

🤖 Generated with Claude Code

https://claude.ai/code/session_01SxX9oscerhv1nsozPbT5aX