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, 0 deletions

diff --git a/tests/drivers/compiler_contract_test.py b/tests/drivers/compiler_contract_test.py
new file mode 100644
index 0000000..63e476c
--- /dev/null
+++ b/tests/drivers/compiler_contract_test.py
@@ -0,0 +1,30 @@
+#!/usr/bin/env python3
+"""accept/reject contracts, selectable in small groups before implementation."""
+import argparse
+import json
+import re
+import subprocess
+from pathlib import Path
+
+parser = argparse.ArgumentParser()
+parser.add_argument('host')
+parser.add_argument('--group')
+parser.add_argument('--case')
+args = parser.parse_args()
+cases = json.loads(Path('tests/spec/compiler_contracts.json').read_text())
+cases = [c for c in cases if (not args.group or c['group'] == args.group) and (not args.case or args.case in c['name'])]
+assert cases, 'no selected contracts'
+failures = []
+for c in cases:
+    source = ('typecheck on;\n' + c['source']).encode()
+    r = subprocess.run([args.host], input=source, capture_output=True, timeout=10)
+    text = (r.stdout + r.stderr).decode(errors='replace')
+    error = bool(re.search(r'(zc:|zc0:|error:|undefined|not defined)', text)) or r.returncode != 0
+    valid = (not error) == c['accept'] and r.returncode >= 0
+    if valid and 'output' in c:
+        valid = r.returncode == 0 and r.stdout.decode() == c['output']
+    print(('ok   ' if valid else 'FAIL ') + c['group'] + ': ' + c['name'])
+    if not valid:
+        failures.append(c['name'])
+        print(text.strip()[:1000])
+raise SystemExit(1 if failures else 0)