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, 6 insertions, 4 deletions

diff --git a/tests/programs/zc0typed.zc b/tests/programs/zc0typed.zc
index 4b7f438..81209bf 100644
--- a/tests/programs/zc0typed.zc
+++ b/tests/programs/zc0typed.zc
@@ -1,20 +1,22 @@
+namespace;
+
 // the stage 0 compiler (src/tools/zc0.c) has no types. it reads them and throws
 // them away, so a typed program and the same program without the types come
 // out as the same image. tests/programs/zc0plain.zc is this file with the types off.
 int total;
-[8]int table;
-[]word names;
+int[8] table;
+word[?] names;
 const int LIMIT = 10;
 
 int add(int a, int b) { return a + b; }
-.u grow([]word v, int n) { return v; }
+.u grow(word[?] v, int n) { return v; }
 bool keep(int.d x, .m y) { return x != y; }
 int apply(int(int) f, int* p, vec<vec<int>>*.u q) { return f(*p); }
 int sq(int x) { return x * x; }
 
 fn start() {
 	int i = 0, sum = 0;
-	[4]int a;
+	int[4] a;
 	int* p = a;
 	for (int j = 0; j < LIMIT; j++) sum = add(sum, sq(j));
 	while (i < 4) { a[i] = i; i++; }