Write the GALAGA tutorial chapters and the repeated-host-calls guide

docs/20 builds the engine and the boundary: the startup order, the
starfield, actors and collision, booting a DEF-only script, the issue #8
mode workaround, the custom update hook, first light, screens, and the
headless harness. docs/21 builds the three shared structures and the AI:
the host type tables, the actor binding, the randomness route around
issue #16, the measured case against structure arguments (issue #36),
the three language rules that shape the script, the maneuvers, the
argued formation decision, the script-death policy, and the interop
proof. Every fenced block runs under tests/docs_examples.sh in both
build configurations; five new preludes carry the C fragments.

docs/10 gains the 'Calling a function every frame' section the chapters
lean on: the per-call akbasic_environment_zero() rule, the set_mode(RUN)
workaround, the clear_error() revival, and the case for rebinding over
structure arguments. Index rows and chapter counts updated.

Co-authored-by: andrew <andrew@aklabs.net>
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XiGgpHuXUm2mR4Wzndw3dc
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@@ -26,7 +26,7 @@ scripting engine for game authors.
| [the issue tracker](https://source.starfort.tech/andrew/akbasic/issues) | **Outstanding defects and gaps.** Labelled by kind and blast radius; `status::grooming` means the scope is not settled yet |
| [`TODO.md`](TODO.md) | The record: settled design decisions, the deviation register, defects already fixed, and the reasoning behind the measurements. §0.1 first — it retires the byte-for-byte fidelity constraint several later sections were written on |
| [`README.md`](README.md) | What the project is and why, for somebody who has not seen it |
| [`docs/`](docs/README.md) | The language itself: eighteen chapters, verb and function reference. [Chapter 14](docs/14-architecture.md) is the interpreter's architecture — the step loop, the pools, the two kinds of error, and how to debug it. [Chapter 15](docs/15-error-codes.md) is the error-code appendix. [Chapters 17](docs/17-tutorial-breakout.md) and [18](docs/18-tutorial-breakout-artwork.md) are tutorials that build the games in `examples/breakout/` |
| [`docs/`](docs/README.md) | The language itself: twenty-one chapters, verb and function reference. [Chapter 14](docs/14-architecture.md) is the interpreter's architecture — the step loop, the pools, the two kinds of error, and how to debug it. [Chapter 15](docs/15-error-codes.md) is the error-code appendix. [Chapters 17](docs/17-tutorial-breakout.md) and [18](docs/18-tutorial-breakout-artwork.md) are tutorials that build the games in `examples/breakout/`; [Chapters 20](docs/20-tutorial-galaga.md) and [21](docs/21-tutorial-galaga-enemies.md) build the embedding host in `examples/galaga/` |
| `deps/libakerror/AGENTS.md` | The `ATTEMPT`/`CLEANUP`/`PROCESS`/`HANDLE`/`FINISH` protocol, authoritatively |
| `deps/libakerror/UPGRADING.md` | 1.0.0's status registry. Required before writing an error code |
| `deps/<library>/AGENTS.md` | Per-repo rules. Read the relevant one **before editing a submodule** |