Read long careers with national teams and flagged name pools; release 0.5.9

[rhiever]

A 26.3.2 career save from #20 failed 19 of its 27 readers, starting with "name pools not found". The save had 4 separate causes, and each fix is general rather than tuned to that save:

• Name pools: The pool header stores nonzero values in a 4-byte field that most saves leave at 0. Those bytes are no longer compared. Every other header byte, each pool entry, and the single-candidate check still are.
• Stage table: The table sat 34.2 MB from the end of game_db, past the 32 MiB search cap that earlier careers had already pushed up twice. The search now doubles to the start of the section, and the stage gates judge the rows it finds.
• Tactics: The manager also runs national teams, and the tactics header counts their blocks. Validation now compares the header with the blocks found by structure and still requires at least the club's teams. Each club block ends at the next stored block, so a national team's block is never read as part of a club block. New anomaly non_club_blocks.
• Generated people: Allocated players stored with object kind 3 (as about 96,000 ordinary players across the corpus are) and allocated staff with ability codes outside the observed set are read instead of dropped.

Prepares patch release 0.5.9. Refs #20.

Validation: the full suite passes (2,944 tests), plus the 43 corpus tests. Lint, formatting, type checks, the docs build, the distribution check, and a wheel smoke test pass. A sweep of all 48 local saves on main and this branch, 1 save at a time with the network denied and checksums compared before and after, shows the #20 save going from 8 to 26 passing readers. No reader result or row count changed on the other 47. Every remaining failure is also on main; the #20 save's finances failure is a separate club-span bug that gets its own PR.

The change contains no save files, fragments, screenshots, or real player data. No decompilation, leaked material, or unlicensed parser code was used.

🤖 Generated with Claude Code