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, 30 insertions, 3 deletions

diff --git a/src/core/io_linux.c b/src/core/io_linux.c
index 8a024aa..aaf6a18 100644
--- a/src/core/io_linux.c
+++ b/src/core/io_linux.c
@@ -1,4 +1,5 @@
 #include <stdio.h>
+#include <string.h>
 #ifdef _WIN32
 #include <fcntl.h>
 #include <io.h>
@@ -7,7 +8,12 @@
 #include <poll.h>
 #endif
 
-int J;
+#if !defined(_WIN32) && !defined(__wasm__)
+#define VM_TLS _Thread_local
+#else
+#define VM_TLS
+#endif
+VM_TLS int J;
 
 #ifdef _WIN32
 static int pk(void){int c=getchar();ungetc(c,stdin);return c==EOF;}
@@ -19,8 +25,8 @@ char Q(void){int c=getchar();J=pk();return c;}
    one would wait for a message that comes only after the answer. so J is 1 only
    when the end is known, and 0 when more may come. the output is flushed before
    any read that can wait, for the same reason. */
-static unsigned char ib[65536];
-static int ip, in, ieof;
+static VM_TLS unsigned char ib[65536];
+static VM_TLS int ip, in, ieof;
 /* make a byte available. wait is 0 to look without waiting. returns 1 when one is ready */
 static int fill(int wait)
 {
@@ -46,6 +52,27 @@ char Q(void)
 	return (char)c;
 }
 #endif
+/* 1 when a byte can be read without waiting: buffered, or already on the pipe */
+int input_pending(void)
+{
+#ifdef _WIN32
+	return 0;
+#else
+	return fill(0);
+#endif
+}
+#ifndef _WIN32
+struct IoSnapshot { unsigned char bytes[65536]; int position, count, ended, flag; };
+size_t io_context_size(void) { return sizeof(struct IoSnapshot); }
+void io_context_snapshot(void *destination) {
+ struct IoSnapshot *snapshot = destination;
+ memcpy(snapshot->bytes, ib, sizeof ib); snapshot->position = ip; snapshot->count = in; snapshot->ended = ieof; snapshot->flag = J;
+}
+void io_context_restore(const void *source) {
+ const struct IoSnapshot *snapshot = source;
+ memcpy(ib, snapshot->bytes, sizeof ib); ip = snapshot->position; in = snapshot->count; ieof = snapshot->ended; J = snapshot->flag;
+}
+#endif
 void G(char c){putchar(c);}
 
 static void init_io(void) {