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, 14 insertions, 11 deletions

diff --git a/examples/struct_closure_opt.zc b/examples/struct_closure_opt.zc
index 67315bf..254ff07 100644
--- a/examples/struct_closure_opt.zc
+++ b/examples/struct_closure_opt.zc
@@ -1,3 +1,6 @@
+namespace;
+include rt;
+
 // struct methods, closures and ownership in one file, written so the
 // compiler's hints have something to say about it. it runs as it is.
 
@@ -12,36 +15,36 @@ struct point {
 	}
 }
 
-fn sink(.d p) { free(d*p); return 0; }
+void sink(.d p) { rt.free(p); return; }
 
 fn features() {
-	// a closure copies the variables it uses when it is made
+	// a closure shares the variables it captures
 	let base = 100;
 	let add = fn(a, b) { return a + b + base; };
 	let total = add(10, 20);
 
-	let p1 = new(point);
+	let p1 = rt.new(point);
 	p1.x = 5; p1.y = 12;
-	let p2 = new(point);
+	let p2 = rt.new(point);
 	p2.x = 0; p2.y = 0;
 
 	// made and given away on the next line, so it never needed a name
-	let tmp = new(2);
-	sink(d*tmp);
+	let tmp = rt.new(2);
+	sink(tmp);
 
 	// allocated again on every pass of the loop
 	let i = 0;
 	while (i < 3) {
-		let scratch = new(10);
+		let scratch = rt.new(10);
 		scratch[0] = i;
-		sink(d*scratch);
+		sink(scratch);
 		i++;
 	}
 
 	return total + p1.dist(p2);
 }
 
-fn main() {
-	put_n(features()); put_c(10);
-	return 0;
+void main() {
+	rt.put_n(features()); rt.put_c(10);
+	return;
 }