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, 40 insertions, 0 deletions

diff --git a/tests/drivers/actor_test.py b/tests/drivers/actor_test.py
new file mode 100644
index 0000000..43a110f
--- /dev/null
+++ b/tests/drivers/actor_test.py
@@ -0,0 +1,40 @@
+#!/usr/bin/env python3
+# exercise syntax injection, isolated workers, typed graph copying and regressions.
+from pathlib import Path
+import argparse
+import subprocess
+import time
+
+parser = argparse.ArgumentParser()
+parser.add_argument('vm', nargs='?', default='bin/zy')
+parser.add_argument('--case', default='')
+parser.add_argument('--library', default='')
+args = parser.parse_args()
+root = Path(__file__).resolve().parents[2]
+expected = {'parallel': '0 0\n11 21\n', 'state': '0 5 7\n4\n', 'graphs': '25 a 5\n', 'results': 'ok\n', 'plain': '3\n', 'module_helpers': '10\n', 'safepoint': '8\n', 'values': '1\n', 'functions': '12\n', 'pointer_scalar': '1\n', 'declaration': '5 7 0 0\n', 'lifecycle': '-1 3\n', 'generic_extensions': '3\n', 'failed_worker': '-1 -1 3\n', 'generic_declaration': '5 7 4 0\n', 'generic_typed_method': '7 2\n'}
+count = 0
+for case in sorted((root / 'tests/actor').glob('*/*.zc')):
+    if args.case and args.case not in str(case):
+        continue
+    start = time.monotonic()
+    source = case.read_text()
+    if args.library:
+        source = source.replace('include rt, actor;', f'include rt; include \"{args.library}\"; include actor;')
+    proc = subprocess.run([str(root / args.vm)], input=source, text=True, capture_output=True, cwd=root, timeout=15)
+    elapsed = time.monotonic() - start
+    if case.parent.name == 'reject':
+        required = {'no_include': "actor: isn't a type", 'input_type': 'type error:', 'output_type': 'type error:', 'explicit_this': 'this is implicit', 'nested_missing_import': 'module access requires `include rt;`', 'generic_input': 'type error:', 'generic_method_return': 'type error:'}[case.stem]
+        assert required in proc.stdout, f'{case}: expected {required!r}, got {proc.stdout!r}'
+    else:
+        actual = proc.stdout
+        if case.stem == 'parallel':
+            lines = actual.splitlines(keepends=True)
+            assert len(lines) == 3, f'invalid parallel output: {actual!r}'
+            runtime_ms = int(lines[-1])
+            assert 280 <= runtime_ms < 580, f'workers did not overlap: {runtime_ms}ms'
+            actual = ''.join(lines[:-1])
+        assert proc.returncode == 0 and actual == expected[case.stem], f'{case}: stdout={proc.stdout!r}, stderr={proc.stderr!r}'
+    print(f'ok   {case.relative_to(root)} ({elapsed:.3f}s)')
+    count += 1
+assert count, 'no actor fixtures selected'
+print(f'{count} actor fixtures passed')