test framework phase 1: forward decls, void-return fix, suite migration

Completes the Phase 1 runner and migrates the 11 test files onto it.

- forward-declare the registry accessors in the test preamble; they are
  defined at the end of the unit but the El runner is compiled in between
- eltest.el: explicit trailing return in the void emit_* helpers, which
  otherwise lower to 'return println(...)' and fail to compile
- test files import runtime/eltest.el explicitly, using the language's own
  textual import mechanism rather than compiler-side auto-injection
- DESIGN.md 6.5: gate on allocation COUNT AND BYTES, not count alone

Verified: self-hosting fixpoint byte-identical (gen2 == gen3). 6 of 11
suites run and report per-test timing. The other 5 fail to COMPILE, and
fail identically under the committed compiler -- pre-existing breakage
this framework makes visible for the first time.

lang/tests/native/test_compiler.el

@@ -1,3 +1,4 @@
+import "../../runtime/eltest.el"
 // tests/native/test_compiler.el — comprehensive tests for the El compiler pipeline.
 //
 // Tests the lexer (lexer.el), parser (parser.el), and codegen (codegen.el)

lang/tests/native/test_core.el

@@ -1,3 +1,4 @@
+import "../../runtime/eltest.el"
 // test_codegen_js.el - basic tests for JS codegen features.
 //
 // These tests verify that core El language features produce correct values

lang/tests/native/test_env.el

@@ -1,3 +1,4 @@
+import "../../runtime/eltest.el"
 // test_env.el - native test suite for runtime/env.el
 //
 // Covers: env() for reading environment variables, args() returning a list,

lang/tests/native/test_fs.el

@@ -1,3 +1,4 @@
+import "../../runtime/eltest.el"
 // test_fs.el - native test suite for runtime/fs.el
 //
 // Covers: fs_write/read round-trip, fs_exists, fs_mkdir, fs_list,

lang/tests/native/test_json.el

@@ -1,3 +1,4 @@
+import "../../runtime/eltest.el"
 // test_json.el - native test suite for runtime/json.el
 //
 // Covers: json_get (dot-path), typed extractors (int, bool, float),

lang/tests/native/test_math.el

@@ -1,3 +1,4 @@
+import "../../runtime/eltest.el"
 // test_math.el - native test suite for runtime/math.el
 //
 // Covers: integer math (abs, max, min), float math (sqrt, log, sin, cos, pi),

lang/tests/native/test_state.el

@@ -1,3 +1,4 @@
+import "../../runtime/eltest.el"
 // test_state.el - native test suite for runtime/state.el
 //
 // Covers: state_set/get/del, state_has, state_get_or, state_keys,

lang/tests/native/test_string.el

@@ -1,3 +1,4 @@
+import "../../runtime/eltest.el"
 // test_string.el - native test suite for runtime/string.el
 //
 // Covers: type conversions, core primitives, comparison and search,

lang/tests/native/test_text.el

@@ -1,3 +1,4 @@
+import "../../runtime/eltest.el"
 // test_text.el - native test suite for text primitives.
 //
 // Mirrors the acceptance corpus in tests/text/examples/ using the

lang/tests/native/test_time.el

@@ -1,3 +1,4 @@
+import "../../runtime/eltest.el"
 // test_time.el - native test suite for runtime/time.el
 //
 // Covers: time_now (positive timestamp), time_to_parts (UTC decomposition),