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, 12 insertions, 9 deletions

diff --git a/examples/repl.zc b/examples/repl.zc
index 235063f..bff96c3 100644
--- a/examples/repl.zc
+++ b/examples/repl.zc
@@ -1,25 +1,28 @@
+namespace;
+include rt, run;
+
 // a repl on the resident compiler: each backtick-separated chunk of input is
 // compiled as a function body and run. definitions (fn ...) can be loaded too:
 // a chunk that starts with "fn" goes through load instead of eval.
 let buf[4000];
 fn readchunk() {
 	let n = 0, c;
-	while (!eof()) {
-		c = get_c();
+	while (!rt.eof()) {
+		c = rt.get_c();
 		if (c == 96) break;
 		if (n < 3999) { buf[n] = c; n++; }
 	}
 	buf[n] = 0;
 	return n;
 }
-fn main() {
+void main() {
 	let q, i;
-	while (!eof()) {
+	while (!rt.eof()) {
 		readchunk();
-		q = tokens(buf);
-		if (q[0] && q[1] == T_ID && q[2] == intern("fn")) load(q);
-		else eval(q);
-		free(d*q);
+		q = run.tokens(buf);
+		if (q[0] && q[1] == run.T_ID && q[2] == run.intern("fn")) run.load(q);
+		else run.eval(q);
+		rt.free(q);
 	}
-	return 0;
+	return;
 }