perf(encode): close small-window dict compress gap (hash-chain matchfinder + borrowed dict kernel) #2041

Job	Run time
Detect changed paths	6s
lint	37s
wasm	1m 28s
cross-i686	1m 31s
test (macos-latest)	1m 11s
test (windows-latest)	2m 43s
test (ubuntu-latest)	1m 13s
c-abi	1m 24s
msrv	1m 20s
no-std	34s
Fuzz smoke	9m 29s
codecov	1m 15s
Resolve bench target matrix	-1s
Build bench binary (${{ matrix.bench.id }})	0s
Bench wasm vs bokuweb (dashboard shard)	-1s
Bench ${{ matrix.bench.id }} / ${{ matrix.shard.id }}	0s
Aggregate benchmark shards per target	0s
Publish benchmark pages payloads	0s
	22m 49s

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