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, 37 insertions, 0 deletions

diff --git a/tests/drivers/thread_context_test.py b/tests/drivers/thread_context_test.py
new file mode 100644
index 0000000..fa3f144
--- /dev/null
+++ b/tests/drivers/thread_context_test.py
@@ -0,0 +1,37 @@
+#!/usr/bin/env python3
+# verify actual threads, independent vm state, parallelism, cancellation and join.
+from pathlib import Path
+import argparse
+import subprocess
+
+parser = argparse.ArgumentParser()
+parser.add_argument('vm', nargs='?', default='bin/zy')
+parser.add_argument('--case', default='')
+parser.add_argument('--library', default='')
+parser.add_argument('--backend', choices=('native', 'micro'), default='native')
+args = parser.parse_args()
+root = Path(__file__).resolve().parents[2]
+expected = {'isolation': '21 16 7 16 7 4 1 1\n', 'parallel': '11 21\n', 'cancel': '0\n', 'cancel_o3': '0\n', 'invalid': '-1 -1\n', 'recycle': '66\n', 'channels': '-1 0\n', 'failed_worker': '5 7\n', 'ffi_o3': '1 5050 0\n', 'actor_identity': '1\n', 'resources': '1 24 0 0 0\n', 'close_order': '0 0 -1\n', 'resources_counts': '24 0 0 0\n', 'nested': '1 0 0 0\n'}
+count = 0
+for case in sorted((root / 'tests/threads').glob('*/*.zc')):
+    if args.case and args.case not in str(case):
+        continue
+    if args.backend == 'micro' and case.stem in ('ffi_o3', 'resources'):
+        print(f'skip {case.relative_to(root)} (native ffi fixture)')
+        continue
+    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=12)
+    actual = proc.stdout
+    if case.stem in ('parallel', 'cancel', 'cancel_o3'):
+        lines = actual.splitlines(keepends=True)
+        assert len(lines) == 2, f'{case}: invalid output {actual!r}, stderr={proc.stderr!r}'
+        milliseconds = int(lines[-1])
+        assert 0 <= milliseconds < (580 if case.stem == 'parallel' else 500), f'{case}: elapsed {milliseconds}ms'
+        actual = lines[0]
+    assert proc.returncode == 0 and actual == expected[case.stem], f'{case}: exit={proc.returncode}, stdout={proc.stdout!r}, stderr={proc.stderr!r}'
+    print(f'ok   {case.relative_to(root)}')
+    count += 1
+assert count
+print(f'{count} thread context fixtures passed')