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/examples/bf.zc b/examples/bf.zc
index 5169b2b..71cf40d 100644
--- a/examples/bf.zc
+++ b/examples/bf.zc
@@ -1,10 +1,13 @@
+namespace;
+include rt, run;
+
 // a brainfuck compiler. it turns a brainfuck program into zc source, hands
 // that to the compiler that's sitting in memory, and runs the result, which on
 // arm64 means native code. runs of + - < > fold into one statement each.
 // give it a program after a backtick, or it runs the hello world below.
 let out[30000], n, depth;
-fn emit(s) { let i = 0; while (s[i]) { out[n] = s[i]; n++; i++; } return 0; }
-fn emitn(int v) { if (v >= 10) emitn(v / 10); out[n] = '0' + v % 10; n++; return 0; }
+void emit(s) { let i = 0; while (s[i]) { out[n] = s[i]; n++; i++; } return; }
+void emitn(int v) { if (v >= 10) emitn(v / 10); out[n] = '0' + v % 10; n++; return; }
 // how many times does c repeat from s[i]
 int run(s, int i, int c) { int k = 0; while (s[i + k] == c) k++; return k; }
 
@@ -37,12 +40,12 @@ let hello = "++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<]<-]>>.>---.+++++++..+
 let prog[20000];
 fn main() {
 	let src = hello, k = 0, lines = 0, i = 0;
-	while (!eof() && k < 19999) { let c = get_c(); if (c != 10) { prog[k] = c; k++; } }
+	while (!rt.eof() && k < 19999) { let c = rt.get_c(); if (c != 10) { prog[k] = c; k++; } }
 	prog[k] = 0;
 	if (k) src = prog;
-	if (translate(src)) { put_s("unbalanced brackets\n"); return 1; }
+	if (translate(src)) { rt.put_s("unbalanced brackets\n"); return 1; }
 	while (out[i]) { if (out[i] == 10) lines++; i++; }
-	put_s("compiled to "); put_n(lines); put_s(" lines of zc, running it:\n");
-	evals(out);
+	rt.put_s("compiled to "); rt.put_n(lines); rt.put_s(" lines of zc, running it:\n");
+	run.evals(out);
 	return 0;
 }