apl: primes sieve (2=+⌿0=A∘.|A)/A←⍳N + apl-compress (+11 tests, 280/280)

plans/apl-on-sx.md

@@ -97,7 +97,7 @@ Core mapping:
 - [ ] Classic programs in `lib/apl/tests/programs/`:
   - [ ] `life.apl` — Conway's Game of Life as a one-liner using `⊂` `⊖` `⌽` `+/`
   - [ ] `mandelbrot.apl` — complex iteration with rank-polymorphic `+ × ⌊` (or real-axis subset)
-  - [ ] `primes.apl` — `(2=+⌿0=A∘.|A)/A←⍳N` sieve
+  - [x] `primes.apl` — `(2=+⌿0=A∘.|A)/A←⍳N` sieve
   - [ ] `n-queens.apl` — backtracking via reduce
   - [ ] `quicksort.apl` — the classic Roger Hui one-liner
 - [ ] System functions: `⎕FMT`, `⎕FR` (float repr), `⎕TS` (timestamp), `⎕IO`, `⎕ML` (migration level — fixed at 1), `⎕←` (print)
@@ -118,6 +118,7 @@ data; format for string templating.
 
 _Newest first._
 
+- 2026-05-07: Phase 6 primes — sieve via outer-product residue + reduce-first + compress; apl-compress added; lib/apl/tests/programs/primes.apl source; +11 tests; 280/280
 - 2026-05-07: Phase 5 conformance.sh + scoreboard.{json,md} — per-suite runner; current snapshot 269/269; **Phase 5 complete**
 - 2026-05-07: Phase 5 valence dispatch — apl-dfn-valence (AST scan for ⍺/⍵), apl-tradfn-valence (slot check), apl-call unified entry; +14 tests; 269/269 tests
 - 2026-05-07: Phase 5 control words — :If/:Else, :While, :For/:In, :Select/:Case via apl-tradfn-eval-block/stmt threading env; :Trap deferred; +10 tests (sum loop, factorial, dispatch, nested); 255/255 tests