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* fix(context): BMP-only injected context to stop astral-surrogate 400s (closes #2787) Claude Code can truncate auto-loaded context (CLAUDE.md / AGENTS.md / .mdc) at a UTF-16 code-unit boundary; if the cut splits an astral emoji's surrogate pair it emits a lone surrogate and the Anthropic API rejects the request with '400 no low surrogate in string' — bricking the session in a way that survives /clear (the bytes live in the always-reloaded context file). - Add src/utils/bmp-safe.ts: toBmpSafe() guarantees every emitted code point is <= U+FFFF (known type markers -> distinct BMP glyphs, other astral -> bullet, lone surrogates dropped). - Apply it at every context-injection write boundary: injectContextIntoMarkdownFile, writeClaudeMdToFolder, and the cursor .mdc writer — so ANY mode (incl. custom) is safe, not just the default markers. - Switch the default 'code' mode (plugin/modes/code.json) and TYPE_ICONS to BMP markers so the source of truth is already clean. - Tests in tests/bmp-safe.test.ts assert output is surrogate-free. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> * test: cursor context now sanitizes astral emoji to BMP (#2787) Update the unicode test to assert the post-#2787 contract: BMP scripts (日本語, العربية) survive untouched while astral emoji are stripped and the output contains no UTF-16 surrogate code units. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>