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, 10 insertions, 7 deletions

diff --git a/examples/cli.zc b/examples/cli.zc
index 113a0da..1ea0e6a 100644
--- a/examples/cli.zc
+++ b/examples/cli.zc
@@ -1,12 +1,15 @@
+namespace;
+include rt, std;
+
 // print the length and first character of the file named by ZC_FILE
-include "src/lib/std.zc";
+include std;
 fn main() {
 	let name[80], s, n;
-	n = Host.env("ZC_FILE", name, 80);
-	if (n < 0) { put_s("no file\n"); return 1; }
-	s = readfile(name);
-	if (!s) { put_s("can't read\n"); return 1; }
-	put_n(len_w(s)); put_c(' '); put_c(s[0]); put_c(10);
-	free(d*s);
+	n = std.Host.env("ZC_FILE", name, 80);
+	if (n < 0) { rt.put_s("no file\n"); return 1; }
+	s = rt.readfile(name);
+	if (!s) { rt.put_s("can't read\n"); return 1; }
+	rt.put_n(rt.len_w(s)); rt.put_c(' '); rt.put_c(s[0]); rt.put_c(10);
+	rt.free(s);
 	return 0;
 }