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, 7 insertions, 4 deletions

diff --git a/examples/mandel.zc b/examples/mandel.zc
index 0a8f69e..b389d40 100644
--- a/examples/mandel.zc
+++ b/examples/mandel.zc
@@ -1,3 +1,6 @@
+namespace;
+include rt;
+
 // the mandelbrot set in 16.16 fixed point. a word is 64 bits, so the product
 // fits and the point sits 16 bits down. the jit inlines it as a multiply and a shift.
 enhance fmul(a, b) micro "a = mul a b; a = sar a 16";
@@ -16,17 +19,17 @@ int escape(int cx, int cy) {
 	}
 	return MAXIT;
 }
-fn main() {
+void main() {
 	int row = 0;
 	while (row < H) {
 		int col = 0, cy = (row * 2400 / (H - 1) - 1200) * ONE / 1000;
 		while (col < W) {
 			int cx = (col * 3200 / (W - 1) - 2200) * ONE / 1000, it = escape(cx, cy);
-			put_c(it == MAXIT ? '@' : shades[it * 11 / MAXIT]);
+			rt.put_c(it == MAXIT ? '@' : shades[it * 11 / MAXIT]);
 			col++;
 		}
-		put_c(10);
+		rt.put_c(10);
 		row++;
 	}
-	return 0;
+	return;
 }