fix: avoid FileTooBig when local usage scans large rollout files

[Loongphy]

Summary

• switch local rollout scanning from whole-file reads to streaming line reads
• avoid failing with FileTooBig when the newest rollout file exceeds 10 MB
• add regression coverage for rollout files larger than 10 MB

Validation

• zig test src/main.zig -lc --test-filter "scan latest usage"
• HOME=/tmp/codex-auth-list-check zig build run -- list
• HOME=/tmp/codex-auth-list-check zig build run -- config api disable
• HOME=/tmp/codex-auth-list-check zig build run -- list

Related

• Close error: FileTooBig #17

Note

Fix FileTooBig error when scanning large rollout files for usage data

• Rewrites scanFileForUsage in sessions.zig to stream the file line-by-line using a buffered reader instead of reading the entire file into memory, allowing rollout files larger than 10 MiB to be processed.
• Adds a max_rollout_line_bytes constant (10 MiB) to cap individual line size; oversized lines are discarded rather than failing the whole scan.
• Switches JSON parsing to typed structs (UsageEventLineJson and friends) with ignore_unknown_fields, and adds a looksLikeUsageEventLine pre-check to skip irrelevant lines cheaply.
• Adds tests in sessions_test.zig covering files >10 MiB, missing trailing newlines, oversized lines, and windows without used_percent.

^{Macroscope summarized 2363a43.}

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commit: 2363a43