Take libakgl 0.7.0, and refuse an over-long type or field name

0.6.0 and 0.7.0 break nothing here: 0.6.0 is three arcade-physics fixes and a
physics.max_timestep property this port does not use, and 0.7.0 reports failures
libakstdlib's wrappers were already catching and takes libakerror 2.0.1 so it
can drop the exit-status trap its own suites needed. That is the same defect
include/akbasic/error.h guards for this band, now fixed at the source rather
than worked around in two places.

The floor moves to 0.7.0 anyway. The soname carries MAJOR.MINOR while the major
is 0, so deciding for ourselves which of libakgl's minor releases were really
compatible is exactly the judgement it exists to take away.

0.7.0 is largely about a defect class worth checking for here rather than
assuming past: ten unterminated strncpy calls into fixed-width name fields. Ours
are clean -- every one is bounded to size - 1 and every buffer is either
explicitly terminated afterwards or memset first, checked site by site. But two
of them, both written last week in src/structtype.c, truncated an over-long name
silently, and truncation is an error everywhere else in this interpreter. It
matters more for a name than for a value: two long type names trimmed to the
same 31 characters collide, and the second is then reported as redeclaring a
type the program never wrote.

Both are refused now, showing the name as written. The check was unreachable as
first drafted, because the prescan read words into a buffer the size of the
limit and so trimmed them before anything could look -- the scratch is twice the
limit now, which is what makes the two cases distinguishable at all.
tests/struct_types.c pins that it stays reachable.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

TODO.md

@@ -1911,7 +1911,7 @@ Dependency baseline:
 |---|---|---|
 | `deps/libakerror` | 2.0.1 | Private ownership-enforced status registry. akbasic reserves 512–767 in `akbasic_error_register()`. Does not namespace its `coverage` target when embedded — worked around in our `CMakeLists.txt`. **2.0.0 is thread safe and an ABI break** (`libakerror.so.2`): `__akerr_last_ignored` is thread-local and `akerr_next_error()` returns an owned reference, neither of which fails to link when mismatched. **2.0.1 fixes an exit status that mattered more to this band than to any other** — see below. |
 | `deps/libakstdlib` | 0.2.0 | soname `libakstdlib.so.0.2`. `AKSL_VERSION_CHECK()` asserted in `tests/version_check.c`. This release fixed all six confirmed defects the port was working around — see §1.9, where the bans are now lifted. |
-| `deps/libakgl` | 0.5.0 | soname `libakgl.so.0.5`. Owns status codes 256–260. Linked and tested under `-DAKBASIC_WITH_AKGL=ON`, which still defaults OFF so the core library and its whole suite build on a machine with no SDL. **0.3.0 closed every API gap this port had filed** — see §7 — so the four workarounds §3 used to list are gone. 0.4.0 was a leak-and-overread release that changed no public struct. **0.5.0 is the first that broke our source as well as our ABI**: it namespaced every exported symbol, so `akgl_render_bind2d` is `akgl_render_2d_bind`, `akgl_sprite_sheet_coords_for_frame` is `akgl_spritesheet_coords_for_frame`, the `renderer`/`camera`/`window` globals carry the prefix, and `_akgl_renderer`/`_akgl_camera` are `akgl_default_renderer`/`akgl_default_camera`. `include/akbasic/akgl.h` asserts the 0.5.0 floor. |
+| `deps/libakgl` | 0.7.0 | soname `libakgl.so.0.7`. Owns status codes 256–260. Linked and tested under `-DAKBASIC_WITH_AKGL=ON`, which still defaults OFF so the core library and its whole suite build on a machine with no SDL. **0.3.0 closed every API gap this port had filed** — see §7 — so the four workarounds §3 used to list are gone. 0.4.0 was a leak-and-overread release that changed no public struct. **0.5.0 is the first that broke our source as well as our ABI**: it namespaced every exported symbol, so `akgl_render_bind2d` is `akgl_render_2d_bind`, `akgl_sprite_sheet_coords_for_frame` is `akgl_spritesheet_coords_for_frame`, the `renderer`/`camera`/`window` globals carry the prefix, and `_akgl_renderer`/`_akgl_camera` are `akgl_default_renderer`/`akgl_default_camera`. `include/akbasic/akgl.h` asserts the floor. **0.6.0 and 0.7.0 broke nothing here** — 0.6.0 is three arcade-physics fixes and a `physics.max_timestep` property this port does not use, and 0.7.0 reports failures `libakstdlib`'s wrappers were already catching and takes `libakerror` 2.0.1. The floor moved anyway, because deciding for ourselves which of libakgl's minor releases were really compatible is the judgement the soname exists to take away. |
 
 **An unhandled error in this band used to exit zero, and 512 is the worst possible base for
 that.** `libakerror`'s default unhandled-error handler ended in `exit(errctx->status)`, and a