Keep a Codex journal per character

[ryanbarlow97]

Each roleplay character now has its own Codex journal, so a new character can discover places and lore again and earn the discovery rewards again (for example the 50 Player EXP for a point of interest). Stacked on #1.

How it works. Codex loads a character's journal from plugins/Codex/characters/<character>.yml when its TLibs character session starts and saves it when the session ends (switch, quit, death or shutdown). Between characters, for example in the selection room, the player has no journal and nothing can be discovered, so no rewards fire without a record. A character's first session creates its file, so characters/ has one file for every character that has played.

Out-of-character reference. An entry the account found before this change, or any of its characters has found since (alive or dead), stays unlocked in /codex and its sub-pages stay openable, so players can still read what they have seen. Click actions on such entries run only when the entry has no click_actions_cooldown, since that cooldown is stored on the character's own entry. The hover text adds "Aldric and Mira can use this in character." (living characters only, the played one first), or "No character can use this in character." When the played character hasn't found it itself, it also adds "Aldric knows this only out of character." Codex reads the other characters' journals when a session starts; they can't change while the account is playing someone else. The three lines are configurable in messages.yml and are added to existing files. Rediscovery, rewards, category progress and placeholders stay per character.

Existing discoveries. No character inherits them, because the old account journals don't record which character found an entry. Each account's players/<account>.yml stays where it is and feeds the out-of-character reference. Its entries show as readable, with "No character can use this in character.", until a character finds them again. Every character, the most-played one included, rediscovers places and earns their rewards again.

Other changes. MySQL storage is removed: neither server used it, and making it per character would have been a second rewrite. Old mysql_database keys in a config are ignored. Saves now run on the main thread, which removes upstream's race between the async save task and players joining or leaving. The plugin needs TLibs (depend) and RPCharacters for character sessions. It doesn't list RPCharacters for load order, because RPCharacters soft-depends on Codex. /codex won't open between characters.

Follow-ups. RPCharacters' codex_percent_/codex_holders_ placeholders read plugins/Codex/players/. They need to read characters/ instead, so they count characters. That will be a separate RPCharacters PR, released together with this one.

Tests. JUnit and Mockito cover the file store, the out-of-character reference, session open and close, unreadable files and save failures. JaCoCo requires 100% line coverage of net.tfminecraft.codex.character; upstream code has no tests. mvn clean verify passes (24 tests).

🤖 Generated with Claude Code

[ryanbarlow97]

Reviewed by Astra (GPT-6-Astra) over four read-only rounds (reports kept locally); every finding fixed, the last with tests for its exact scenario. Merging with admin bypass. Not released or deployed.