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, 32 insertions, 0 deletions

diff --git a/tests/drivers/icon_test.py b/tests/drivers/icon_test.py
new file mode 100644
index 0000000..560c622
--- /dev/null
+++ b/tests/drivers/icon_test.py
@@ -0,0 +1,32 @@
+#!/usr/bin/env python3
+# execute isolated icon acceptance, rejection and regression fixtures.
+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('--js', action='store_true')
+parser.add_argument('--source', action='store_true', help='test the working library source instead of the embedded module')
+args = parser.parse_args()
+root = Path(__file__).resolve().parents[2]
+cases = sorted((root / 'tests/icon').glob('*/*.zc'))
+count = 0
+for case in cases:
+    if args.case and args.case not in str(case):
+        continue
+    expected = case.with_suffix('.expected').read_text()
+    command = ['node', str(root / 'src/js/tinyvm.js')] if args.js else [str(root / args.vm)]
+    program = case.read_text()
+    if args.source:
+        # keep module imports while suppressing its embedded source loader.
+        library = (root / 'src/lib/icon.zc').read_text()
+        setup = '\nnamespace;\ninclude run;\nimmediate fn icon_working_source() { run.icon_done = 1; run.next(); return 0; }\nicon_working_source\n'
+        program = library + setup + program
+    proc = subprocess.run(command, input=program, text=True, capture_output=True, cwd=root, timeout=30)
+    assert proc.returncode == 0 and proc.stdout == expected, f'{case.relative_to(root)}\nstdout: {proc.stdout}\nstderr: {proc.stderr}\nexpected: {expected}'
+    print(f'ok   {case.relative_to(root)}')
+    count += 1
+assert count, 'no icon fixtures selected'
+print(f'{count} icon fixtures passed')