feat(page-cluster): add URL-path and stylesheet blocking-key derivation#902
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Add derivePathGroupKey and deriveStylesheetGroupKey, two independent "blocking key" functions (record-linkage sense) that turn a page's URL path segments and loaded-stylesheet list into coarse partition keys. These feed a future classifier's homogeneous-group discovery step, ahead of the expensive structural comparison tokenize()/jaccardSimilarity() already provide. Export HASH_LENGTH from hash-content.ts so deriveStylesheetGroupKey reuses the same hash truncation length instead of picking its own. Add "hrefs" to the cspell word list, used across the new files' JSDoc and tests.
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Summary
derivePathGroupKeyandderiveStylesheetGroupKey: two independent "blocking key" functions (record-linkage sense — see Fellegi-Sunter, canopy clustering, DNF blocking scheme) that turn a page's URL path segments and its loaded-stylesheet URL list into coarse partition keys.tokenize()/jaccardSimilarity()/arrayEditDistance()already provide (PR feat(page-cluster): add Jaccard similarity and array edit distance primitives #900, feat(page-cluster): add frequency-based template/content token split #901). Combining the two keys into an actual grouping decision is intentionally out of scope here — literature on blocking recommends keeping independent blocking predicates separate (OR-combined) rather than merging them into one composite key.HASH_LENGTHfromhash-content.tssoderiveStylesheetGroupKeyreuses the same hash truncation length instead of introducing a second one.Test plan
yarn buildyarn lintyarn test(1164 tests passing)/code-review xhigh(trailing-slash path segments, delimiter-collision in stylesheet hashing, bare-string type-safety hole)