initial: actor-test v0.1.0 — 8 assertions

Phase-A.5 test-lib for lib-core.actor. Covers create-validation
(missing/zero movement_speed loud-errors + valid spec), position
(initial x/y), move ((0,0) no-op + additive delta), movement_speed.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

README.md

@@ -0,0 +1,27 @@
+# lib-core.actor-test
+
+Test-lib for `lib-core.actor` v0.1.0. Follows the P.2.4 Test-Module-
+Pattern: exports `run_tests(ctx)` invoked by the engine's `--test-libs`
+runner; uses `engine.test.*` for TAP-style output.
+
+**Version:** 0.1.0
+**Lib-ID:** lib-core.actor-test
+**Role:** test
+**Requires:** lib-core.actor v0.1.0, lib-core.composition v0.1.0
+**Tags:** test, actor
+
+## Coverage (8 assertions)
+
+| Group | Count | What |
+|---|---|---|
+| `create` validation | 3 | missing-movement_speed error, zero-movement_speed error, valid-spec returns handle |
+| `position` | 2 | initial x, initial y |
+| `move` | 2 | (0,0) is no-op, additive delta updates position |
+| `movement_speed` | 1 | reads override value |
+
+## Run
+
+```bash
+~/Projects/Sporel/sporel-engine/build/sporel \
+    --test-libs=lib-core.actor-test
+```