build: bundle cpd/scc/biome/ruff for all 5 platforms via Git LFS

Completes the self-contained, offline-from-clone engine set (ast-grep + cpd + scc +
biome + ruff) across linux x64/arm64, darwin x64/arm64, win32 x64. checksums.txt now
covers all 25 tool×platform binaries; manifest + first-run fetch kept ready in case we
switch to fetch-on-demand later.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

bin/checksums.txt

@@ -4,6 +4,22 @@ bdc4ad8bd72ae05a9c816296ccace501dafb3fb4a98df0a87fe49699b016057d  darwin-x64/ast
 428f35359b297f7562cfc536bdf3104fdc6bc6c50ab38df70994ec15e992df0b  darwin-arm64/ast-grep
 584c59eaf3b50bf436ad43cf36193af1d2fe5e29ddb21b7485c39f131691390f  win32-x64/ast-grep.exe
 f2e2d03a17da85afe6706b84ebe4839f09886abbda6c90ff707ecb949397aece  linux-x64/cpd
+012e5195b8da8cd1868cae68a48b88a0e467958571dd74f466bab77711889081  linux-arm64/cpd
+b05721a128ae9250a9ce147c74745945eda763333cb38a19793568dc8a182885  darwin-x64/cpd
+97eae2490b7cb84e137f8bf3adcaec0a05d198efdadd366645d1b000b8459abc  darwin-arm64/cpd
+3a2e71a3647168761b61f37f0f742b5a084ecb79e57242906d72777073745071  win32-x64/cpd.exe
 1fde0c8fcd2b31f65d18caa442331eb015171fdb71ba9177df95af0d42e44126  linux-x64/scc
+e2d85c4b15a0900f2f07663f025fa64b90d2e4bf957e761e9a666839ac25afbd  linux-arm64/scc
+dada362eaa3bc92c1d17a360097b21ba195675b664a73c3cd82db4188ef6a533  darwin-x64/scc
+ecfd9c37119ffe354b96d5cc37b0e5eafaa7f454c5d05566c9ba9ff9da3a57d9  darwin-arm64/scc
+122c379b537ac5c168e12a9d87c218bdea00f53129f21912f3cca283584f6994  win32-x64/scc.exe
 e7df298f0551dd90bea4425779369aa3130d9817f4acc4f663ef63c327206a19  linux-x64/biome
+27c9bc5994dfb5711f5f09a4c3c35749ca9c4a898a063bb062e6b932dbc2571d  linux-arm64/biome
+0c7002cc808eebabe7852c8417b9deb1a5615342e6881c588b49367c6c56db8c  darwin-x64/biome
+9b9e04f749db6b037b0ad38ba0c5cce63b185a7cc3b049e577dad3c18f4adb2c  darwin-arm64/biome
+84d4e71fdbb4b15b1aa83c1b1cc033aae9856d48a7a857c1381b1bd499430f7c  win32-x64/biome.exe
 67ccd1209756fa588e35db5e46969cabed37f0df7e9ecfa4985895490733d3a1  linux-x64/ruff
+5e42bac7787f587a75c1c7069f0723e504cd5661ed5fe1ab2c2172707bb467b0  linux-arm64/ruff
+058ec2c97b12b5051c355b4844047df753a934a0fa3793f9f168686145d37f78  darwin-x64/ruff
+37483f9c3ad430308330212eaeea754423190ff8efa2b0fa114323fa80221955  darwin-arm64/ruff
+672f56ff9556c15d2d84f091094f2af853cb7ec09204935ba43119735944f56e  win32-x64/ruff.exe