fix(git): honor status_max_files and status_max_untracked (#3296)

[NanoRisk6]

What Problem This Solves

[limits].status_max_files and status_max_untracked in RTK config were never applied. rtk git status printed the full porcelain list on large WIP monorepos, so the highest-volume git command skipped the configured compaction. Fixes #3296.

Why This Change Was Made

format_status_inner now caps tracked changes and untracked entries separately using config::limits(), and appends an overflow line (... +N more changed/untracked) when truncated. Tests can pass unlimited caps for the full-path recovery case.

User Impact

Large repos respect status_max_files / status_max_untracked (defaults 15 / 10). Agents and humans get compact status with an explicit remainder count instead of a wall of paths.

Evidence

cargo test --bin rtk test_format_status
# 9 passed including test_format_status_honors_status_max_files_and_untracked

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