When the Percentage Looks Wrong
Every confusing statusline behaviour is a lesson about the harness underneath - the token arithmetic that refuses to match, the 300ms debounce, the five-second timeout, and the escape codes that fight back.
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Five Scripts and One Settings Key
The statusline build, end to end - a stdin JSON contract, an entry point that reads once and delegates, a colour-coded session line, git platform routing, and the single settings.json entry that wires it all in.
A Statusline Is a Tiny Harness
The first exercise I give anyone learning to direct coding agents has no prompt in it at all - it is a status bar. Why sixty lines of PowerShell teach context and harness thinking better than any lecture about either.