kernel: $and? / $or? short-circuit + 10 tests [shapes-reflective]

Operatives (not applicatives) so untaken args are not evaluated. Empty
$and? = true, empty $or? = false (Kernel identity convention). Returns
last evaluated value, not bool-coerced. Sketched reflective short-
circuit API: identical protocol across reflective Lisps because
operative semantics are forced — an applicative variant defeats the
purpose. 252 tests total.

plans/kernel-on-sx.md

@@ -108,6 +108,12 @@ When the second consumer arrives, the extraction work is: rename `kernel-*` →
 
 **May propose:** `lib/guest/reflective/` sub-layer — environment manipulation, evaluator-as-value, applicative/operative dispatch protocols.
 
+**Proposed `lib/guest/reflective/short-circuit.sx` API** (from $and?/$or? chiselling — pending second consumer):
+- `(refl-short-and? ARGS DYN-ENV)` — recursive walker; evaluates each in DYN-ENV, returns first falsy value or last truthy. Identity is `true`.
+- `(refl-short-or? ARGS DYN-ENV)` — symmetric; returns first truthy or last falsy. Identity is `false`.
+- Both must be defined as operatives in any reflective Lisp because short-circuit semantics require staged evaluation — an applicative would force every argument before any decision could be made.
+- Driving insight: short-circuit booleans are a forcing function for "operative semantics matter". Languages that lack first-class operatives have to special-case these as keywords; languages with operatives get them for free, in user code.
+
 **Proposed `lib/guest/reflective/quoting.sx` API** (from quasiquote chiselling — pending second consumer):
 - `(refl-quasi-walk FORM ENV)` — top-level entry. Recursively walks FORM; an `$unquote` sub-expression is evaluated in ENV and replaces itself in the result.
 - `(refl-quasi-walk-list FORMS ENV)` — walks a list of forms, splicing `$unquote-splicing` results inline.
@@ -154,6 +160,7 @@ The motivation is that SX's host `make-env` family is registered only in HTTP/si
 
 ## Progress log
 
+- 2026-05-11 — `$and?` / `$or?` short-circuit booleans. Operatives (not applicatives) so untaken arguments are NOT evaluated. Identity values: `$and?` empty = true, `$or?` empty = false. Returns the last evaluated value (Kernel convention — not coerced to bool). 10 new tests including the short-circuit verification (`($and? #f nope)` returns false without evaluating `nope`). chisel: shapes-reflective. Sketched `lib/guest/reflective/short-circuit.sx` API; the protocol is identical across reflective Lisps because short-circuit FORCES operative semantics — an applicative variant would defeat the purpose. 252 tests total.
 - 2026-05-11 — `$cond` / `$when` / `$unless`. Standard Kernel control flow added: `$cond` walks clauses in order, evaluates first truthy test, runs that clause's body in sequence; `else` is the catch-all symbol; empty cond and no-match cond return nil. `$when` and `$unless` are simple conditional execution. All three preserve hygiene (clauses not taken are NOT evaluated). 12 new tests in `tests/standard.sx`. chisel: nothing. 242 tests total. (Third `nothing` in a row but allowable here — these are textbook Kernel idioms with no novel reflective angle.)
 - 2026-05-11 — `$quasiquote` runtime. The parser's reader macros (Phase 1.5) produced unevaluated `$quasiquote`/`$unquote`/`$unquote-splicing` forms; the runtime side now interprets them. `kernel-quasiquote-operative` walks the template via mutual recursion `knl-quasi-walk` ↔ `knl-quasi-walk-list`: atoms and empty lists pass through; an `($unquote X)` head form returns `(kernel-eval X dyn-env)`; an `($unquote-splicing X)` *inside* a list evaluates X and splices its list result via `knl-list-concat`. Nesting depth (`` `\`...\` ``) is not tracked — for Phase-1.5 simplicity, nested quasiquotes flatten. 8 new tests in `tests/standard.sx`. chisel: shapes-reflective. The quoting walker shape is universal across reflective Lisps; sketched the `lib/guest/reflective/quoting.sx` candidate API (`refl-quasi-walk`, `refl-quasi-walk-list`, `refl-list-concat`). 230 tests total.
 - 2026-05-11 — Multi-expression body for `$vau`/`$lambda`. Both forms now accept `(formals env-param body1 body2 ...)` / `(formals body1 body2 ...)`. Implementation: `:body` slot now holds a LIST of forms (was a single expression); `kernel-call-operative` calls a new `knl-eval-body` that evaluates each in sequence, returning the last. No dependency on `$sequence` being in static-env — the iteration lives at the host level. 5 new tests in `tests/vau.sx` (multi-body lambda, multi-body vau, sequenced `$define!`, zero-arg multi-body). chisel: nothing (Kernel-internal improvement; doesn't change the reflective API surface). 223 tests total.