Lycohism

v0.9.34-ALPHA onboarding pass (#1)

• First-join welcome hint (5 lines, shown once per account, state persisted in playerdata)
• /lyco progress already surfaces the current objective first; documented as stuck-recovery entry point
• Sealed Shrine: protect controller block and chest from being broken before the player solves the puzzle (shouldProtectBreak pure seam + 5 new unit tests)
• Lang: messages.welcome + messages.puzzle.seal.protected-break added to lang_zh.yml and lang_en.yml
• Version bumped to 0.9.34-ALPHA; README, docs/FEATURES.md, docs/TUTORIAL.md updated