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, 26 insertions, 23 deletions

diff --git a/examples/lang.zc b/examples/lang.zc
index 6e992b4..dc814d1 100644
--- a/examples/lang.zc
+++ b/examples/lang.zc
@@ -1,49 +1,52 @@
+namespace;
+include rt, run;
+
 // growing the language from inside a program, while it compiles
 
 // x |> f calls f(x). on a stack machine that's just "call": the value is
 // already on the stack, under f's address.
-immediate fn pipe_op() { next(); add_binop("|>", 1, "c"); return 0; }
+immediate fn pipe_op() { run.next(); run.add_binop("|>", 1, "c"); return 0; }
 pipe_op
 
 // unless (c) stmt
 immediate fn unless() {
 	let a;
-	next(); expect(intern("(")); plainuse(expr()); rval(); expect(intern(")"));
-	emitseq(useq[0], ulen[0]);		// not
-	a = hole(); op(O_JZ);
-	substmt();
-	setlit(a, here);
+	run.next(); run.expect(run.intern("(")); run.plainuse(run.expr()); run.rval(); run.expect(run.intern(")"));
+	run.emitseq(run.useq[0], run.ulen[0]);		// not
+	a = run.hole(); run.op(run.O_JZ);
+	run.substmt();
+	run.setlit(a, run.here);
 	return 0;
 }
 // assert (c): the failure message carries the line it was written on
-fn assert_fail(int line) { put_s("assertion failed on line "); put_n(line); put_c(10); halt(); return 0; }
+void assert_fail(int line) { rt.put_s("assertion failed on line "); rt.put_n(line); rt.put_c(10); rt.halt(); return; }
 immediate fn assert() {
-	let a, l = tline;
-	next(); expect(intern("(")); plainuse(expr()); rval(); expect(intern(")"));
-	emitseq(useq[0], ulen[0]);		// not: the jump below skips the failure when it holds
-	a = hole(); op(O_JZ);
-	lit(l); callname(intern("assert_fail")); op(O_DROP);
-	setlit(a, here);
+	let a, l = run.tline;
+	run.next(); run.expect(run.intern("(")); run.plainuse(run.expr()); run.rval(); run.expect(run.intern(")"));
+	run.emitseq(run.useq[0], run.ulen[0]);		// not: the jump below skips the failure when it holds
+	a = run.hole(); run.op(run.O_JZ);
+	run.lit(l); run.callname(run.intern("assert_fail")); run.op(run.O_DROP);
+	run.setlit(a, run.here);
 	return 0;
 }
 // times N { body }: the body pasted N times, at compile time
 immediate fn times() {
 	let n, b, i = 0;
-	next(); n = tv; next();
-	b = grab();
-	while (i < n) { feed(qdup(b)); i++; }
-	free(d*b);
+	run.next(); n = run.tv; run.next();
+	b = run.grab();
+	while (i < n) { run.feed(run.qdup(b)); i++; }
+	rt.free(b);
 	return 0;
 }
 
 fn double(x) { return x * 2; }
 fn inc(x) { return x + 1; }
-fn main() {
-	put_n(5 |> double |> inc |> double); put_c(10);
-	unless (1 > 2) put_s("one isn't bigger than two\n");
-	times 3 { put_c('*'); }
-	put_c(10);
+void main() {
+	rt.put_n(5 |> double |> inc |> double); rt.put_c(10);
+	unless (1 > 2) rt.put_s("one isn't bigger than two\n");
+	times 3 { rt.put_c('*'); }
+	rt.put_c(10);
 	assert(double(4) == 8);
 	assert(inc(1) == 3);
-	return 0;
+	return;
 }