feat(hooks): honor hideStatus for the Claude Code statusline badge (#659)

[ousamabenyounes]

Summary

Fix #659

getHideStatus() (reading PONYTAIL_HIDE_STATUS / config.hideStatus) lives in the shared hooks/ponytail-config.js, but only pi-extension reads it. On native Claude Code / Codex the statusline scripts ignore it and always draw the [PONYTAIL] badge — the reporter set the variable and nothing happened.

The statusline scripts are shell / PowerShell that only stat .ponytail-active, so teaching them to parse config would be the wrong layer. Instead, following the reporter's suggestion:

• ponytail-activate.js already reads the config at SessionStart. It now resolves getHideStatus() once and drops (or clears) a sibling .ponytail-hidden marker via a new best-effort setHidden() in ponytail-runtime.js (written next to the mode flag, so CLAUDE_CONFIG_DIR stays consistent).
• ponytail-statusline.sh and ponytail-statusline.ps1 bail out (exit 0, no output) when the marker is present.
• The marker is rewritten every session start, so unsetting the value brings the badge back on its own next session.
• scripts/uninstall.js removes the marker too.

No config parsing added to the per-render shell scripts (they still just stat files), no new dependency.

Test verification (RED → GREEN)

New tests/statusline-hide.test.js drives the real hook: activate then statusline.sh, covering env var, config.hideStatus, and toggle-back-on. tests/uninstall.test.js gains an assertion that the marker is removed.

RED — prod reverted, new tests present:

not ok 1 - tests/statusline-hide.test.js
not ok 2 - tests/uninstall.test.js
# pass 0
# fail 2

GREEN — with the fix:

# tests 2
# pass 2
# fail 0

Full suite (node --test tests/*.test.js pi-extension/test/*.test.js), iso-or-better vs main:

main : # pass 106  # fail 1   (csv: correct pandas one-liner — pre-existing, pandas not installed)
fix  : # pass 107  # fail 1   (same pre-existing failure; +1 new passing test)

node scripts/check-rule-copies.js stays green.

Files changed

File	Change
hooks/ponytail-runtime.js	add .ponytail-hidden marker + best-effort setHidden()
hooks/ponytail-activate.js	write/clear the marker from getHideStatus() at SessionStart
hooks/ponytail-statusline.sh	bail when the marker is present
hooks/ponytail-statusline.ps1	bail when the marker is present
scripts/uninstall.js	remove the marker on uninstall
tests/statusline-hide.test.js	new round-trip test
tests/uninstall.test.js	assert marker removed