Feat/terminal title and cache prefix#169
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July 11, 2026 11:55
The Anthropic cache breakpoint sat at the end of the whole system string, so the volatile per-run '# Environment' block (git status, rebuilt each turn) invalidated the large static base prompt across turns. Split the breakpoint onto the stable span before that marker; the two system text blocks concatenate byte-for-byte, so the model sees identical content. Within-turn caching is unchanged. Adds 2 tests.
Set the terminal tab/window title via OSC 0: a pulsing glyph + the user's current prompt while working, a static badge when idle. Auto-disabled on non-TTYs/dumb terminals. VS Code hides program-set titles by default, so first launch inside VS Code/Cursor/Windsurf safely configures terminal.integrated.tabs.title once (backup + re-parse validation, never overwrites a user value); /terminal-setup re-runs it. New config flag terminal_title (default on).
…behavior News entries (README + docs/news.md); reference.md gets a Terminal Tab Title section, the /terminal-setup command, and terminal_title/prompt_cache config keys; features.md gets terminal-title and prompt-caching rows.
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