* feat(#2160): collapse verbose '(1M context)' model suffix to compact (1M) badge
Claude Code appends " (1M context)" to the model display name in
long-context sessions, eating 12 characters of statusline width. Collapse
it to " (1M)" — the signal stays, the width doesn't. Any other display
name passes through unchanged.
Claude-Session: https://claude.ai/code/session_01Hme55Pvq6BhpgwBcyC5HAg
* docs(#2160): changeset fragment for PR #2173
* fix(#2160): review fixes — ctx variant, boundary test, changeset format
- broaden the suffix match with a context|ctx alternation (approval-condition
variant the regex missed)
- pin non-context parentheticals ((beta), (deprecated)) as untouched
- changeset body ends with the (#2160) citation per house convention
Claude-Session: https://claude.ai/code/session_01Hme55Pvq6BhpgwBcyC5HAg
* test: regenerate golden-install-parity fixtures for the statusline hook change
Claude-Session: https://claude.ai/code/session_01Hme55Pvq6BhpgwBcyC5HAg
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Co-authored-by: Tom Boucher <trekkie@nomorestars.com>
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