HS-plan: log Bucket F empty multi-element fix +1; sync scoreboard

empty .class compiled (empty-target (query ".class")) to
(hs-empty-target! (hs-query-first ".class")) via hs-to-sx — only
emptying the first match. Fix: detect (query ...) target in the
empty-target compiler case and emit (for-each (fn (_el)
(hs-empty-target! _el)) (hs-query-all sel)) instead, mirroring the
add-class pattern. Suite hs-upstream-empty: 12/13 → 13/13.
Smoke 0-195: 175/195 unchanged.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/hyperscript/compiler.sx

@@ -1547,7 +1547,17 @@
                         (emit-set
                           tgt
                           (list (quote hs-empty-like) (hs-to-sx tgt))))
-                      (true (list (quote hs-empty-target!) (hs-to-sx tgt))))))
+                      (true
+                        (if
+                          (and (list? tgt) (= (first tgt) (quote query)))
+                          (list
+                            (quote for-each)
+                            (list
+                              (quote fn)
+                              (list (quote _el))
+                              (list (quote hs-empty-target!) (quote _el)))
+                            (list (quote hs-query-all) (nth tgt 1)))
+                          (list (quote hs-empty-target!) (hs-to-sx tgt)))))))
                 ((= head (quote open-element))
                   (list (quote hs-open!) (hs-to-sx (nth ast 1))))
                 ((= head (quote close-element))

plans/hs-conformance-scoreboard.md

@@ -4,10 +4,10 @@ Live tally for `plans/hs-conformance-to-100.md`. Update after every cluster comm
 
 ```
 Baseline:   1213/1496 (81.1%)
-Merged:     1309/1496 (87.5%)   delta +96
+Merged:     1310/1496 (87.6%)   delta +97
 Worktree:   all landed
 Target:     1496/1496 (100.0%)
-Remaining:  ~193 tests (clusters 17/29(partial)/31 blocked; 33/34 partial)
+Remaining:  ~192 tests (clusters 17/29(partial)/31 blocked; 33/34 partial)
 ```
 
 ## Cluster ledger
@@ -85,6 +85,7 @@ Defer until A–D drain. Estimated ~25 recoverable tests.
 | # | Cluster | Status | Δ | Commit |
 |---|---------|--------|---|--------|
 | F1 | add CSS template interpolation | done | +1 | 5a76a040 |
+| F2 | empty multi-element (query→for-each) | done | +1 | 875e9ba3 |
 
 ## Buckets roll-up
 

plans/hs-conformance-to-100.md

@@ -177,6 +177,9 @@ Many tests are `SKIP (untranslated)` because `tests/playwright/generate-sx-tests
 
 ## Progress log
 
+### 2026-04-26 — Bucket F: empty multi-element fix (+1)
+- **875e9ba3** — `HS: empty multi-element fix (+1 test)`. `empty .class` compiled `(empty-target (query ".class"))` through `hs-to-sx` → `(hs-empty-target! (hs-query-first ".class"))` which only emptied the first match. Fix: detect `(query ...)` target in the `empty-target` compiler case and emit `(for-each (fn (_el) (hs-empty-target! _el)) (hs-query-all sel))`, mirroring the `add-class` pattern. Suite hs-upstream-empty: 12/13 → 13/13. Smoke 0-195: 175/195 unchanged.
+
 ### 2026-04-26 — Bucket F: add CSS template interpolation (+1)
 - **5a76a040** — `HS: add CSS template interpolation fix (+1 test)`. `add {color: ${}{"red"}}` uses two consecutive brace groups: the empty `${}` marker followed by `{"red"}` for the actual value. The prior parser fix called `parse-expr` when already at the closing `}` of the empty group, returning nil. Fix: detect the empty-brace case (`brace-open` → immediately `brace-close`), skip it, then read the actual value from the next `{…}` block. Also handles normal `${expr}` correctly. Suite hs-upstream-add: 17/19 → 18/19. Smoke 0-195: 174/195 → 175/195.
 

shared/static/wasm/sx/hs-compiler.sx

@@ -1547,7 +1547,17 @@
                         (emit-set
                           tgt
                           (list (quote hs-empty-like) (hs-to-sx tgt))))
-                      (true (list (quote hs-empty-target!) (hs-to-sx tgt))))))
+                      (true
+                        (if
+                          (and (list? tgt) (= (first tgt) (quote query)))
+                          (list
+                            (quote for-each)
+                            (list
+                              (quote fn)
+                              (list (quote _el))
+                              (list (quote hs-empty-target!) (quote _el)))
+                            (list (quote hs-query-all) (nth tgt 1)))
+                          (list (quote hs-empty-target!) (hs-to-sx tgt)))))))
                 ((= head (quote open-element))
                   (list (quote hs-open!) (hs-to-sx (nth ast 1))))
                 ((= head (quote close-element))