feat: grow memory limits, add icon/actor libraries, overhaul LSP diagnostics

Compiler and VM
- make every memory map limit dynamic and adjustable at both build time and
  runtime, including compiler tables, stacks, and every execution region
- reserve and grow tables, operand and return stacks, frame segments, and
  image-building output without relocating live code or globals
- rename i/o and string helpers consistently (puts -> put_s, putn -> put_n,
  scat -> cat_s) across compiler, runtime, examples, tests, and docs
- recast and consume values assigned to globals from inside functions
- allow fixed and const together, add typed closure returns (fn:t(...)),
  multi-include syntax (include rt, run, core;), and recurse type inference
- never infer string literals as word, anywhere, as argument, variable, or
  return type
- draft docs/BORROW.md: a borrow checker less intrusive than Rust's but more
  intelligent

LSP and editor integration
- require explicit includes and give every toolchain area its own namespace
  (rt, lsp, run, core)
- hover for built-in types, inferred types, values known at hover time, array
  and pointer lifetime/size, library names in include statements, and inferred
  lifetimes with explanations
- honor /* */ comments as documentation for variables and arguments, and stop
  misattributing section headers or trailing comments as variable hints
- stream diagnostics and cancel stale requests on change
- jump to definition and references, including cross-file
- quick fixes with automatic library import, and namespace completion

Hints and diagnostics
- render hints as blue squigglies by default, with hints on/small/off per file
- suppress magic-number hints via a preceding /* */ comment, and say so
- warn on unused arguments; allow multiple _ discards in parameters, pattern
  matching, and tagged enums, warning if a _ is actually used
- rewrite hint and comment prose in professional compiler-doc register

Libraries
- add icon.zc: run-time self-modification, find/replace syntax, type and block
  edits, and step-through inspection of locals and globals
- add actor.zc: async actors with Actor<I,O>, implicit this, spawn/recv/send,
  injected into the compiler machinery at include time rather than built in

Tooling and docs
- reorganize sources, tests, and designs into subdirectories
- unify windows entry points in tinyvm.bat and add a matching tinyvm.sh
- add --help across the toolchain
- polish the learning guide, stdlib docs, and design notes

Tests
- add accept, reject, and regression coverage across the compiler, LSP,
- runtime, icon, actors, threads, formatting, and the toolchain contracts,
  plus fuzzers and property tests

1 files changed, 9 insertions, 6 deletions

diff --git a/tests/programs/structret.zc b/tests/programs/structret.zc
index 708c83c..5e99653 100644
--- a/tests/programs/structret.zc
+++ b/tests/programs/structret.zc
@@ -1,3 +1,6 @@
+namespace;
+include rt;
+
 // structs returned from native functions: the stub makes the result (a new object,
 // owned by the caller) and the native call fills it in. the helper library is built
 // by test.sh (build/sbv.so).
@@ -14,11 +17,11 @@ extern struct Mixed mkmixed(long a, double x);
 extern struct Vec3 mkv3(double x);
 int main() {
 	Pair* p; Vec* v; Trio* t; Mixed* m; Vec3* w;
-	cload(b"build/sbv.so");
-	p = mkpair(3, 4); put_n(p.a); put_c(32); put_n(p.b); put_c(32);
-	v = mkvec(2.5, 3.0); put_f(v.x); put_c(32); put_f(v.y); put_c(32);
-	t = mktrio(7, 8, 9); put_n(t.a + t.b + t.c); put_c(32);
-	m = mkmixed(7, 0.5); put_n(m.a); put_c(32); put_f(m.x); put_c(32);
-	w = mkv3(1.5); put_f(w.z); put_c(10);
+	rt.cload(b"build/sbv.so");
+	p = mkpair(3, 4); rt.put_n(p.a); rt.put_c(32); rt.put_n(p.b); rt.put_c(32);
+	v = mkvec(2.5, 3.0); put_f(v.x); rt.put_c(32); put_f(v.y); rt.put_c(32);
+	t = mktrio(7, 8, 9); rt.put_n(t.a + t.b + t.c); rt.put_c(32);
+	m = mkmixed(7, 0.5); rt.put_n(m.a); rt.put_c(32); put_f(m.x); rt.put_c(32);
+	w = mkv3(1.5); put_f(w.z); rt.put_c(10);
 	return 0;
 }