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Three-part change: (a) tests/hs-run-filtered.js gets a per-test __hsCookieStore Map, a globalThis.cookies Proxy, and a document.cookie getter/setter that reads/writes the store. Per-test reset clears the store. (b) generate-sx-tests.py declares cookies in the test header and emits hand-rolled deftests for basic set / update / length-when-empty (the three tractable tests). (c) regenerated spec/tests/test-hyperscript-behavioral.sx via mcp_hs_test.regen. No .sx edits — `set cookies.foo to 'bar'` already compiles to (dom-set-prop cookies "foo" "bar") which routes through host-set!. Suite hs-upstream-expressions/cookies: 0/5 → 3/5. Smoke 0-195 unchanged at 170/195. Remaining `basic clear` (needs hs-method-call host-call dispatch) and `iterate` (needs hs-for-each host-array recognition) need runtime.sx edits — deferred to a future sx-tree worktree. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>