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, 14 insertions, 0 deletions

diff --git a/tests/drivers/lsp_wasm.js b/tests/drivers/lsp_wasm.js
index 4ff2d16..e49bcc5 100644
--- a/tests/drivers/lsp_wasm.js
+++ b/tests/drivers/lsp_wasm.js
@@ -79,6 +79,20 @@ const diagsOf = (s, uri) => s.notes.filter(m => m.method === 'textDocument/publi
 	const h2 = s2.replies[6];
 	check(h2 && h2.result && /packed documentation/.test(h2.result.contents.value), 'hover shows the docs of a compiler name', h2);
 }
+// definition navigation returns the embedded runtime source through the wasm host.
+{
+	const src = 'include rt; fn main() { return rt.s_to_n(b"42"); }\n';
+	const s = session([['file:///nav.zc', src]]);
+	const at = src.indexOf('s_to_n'), before = src.slice(0, at);
+	s.send({ jsonrpc: '2.0', id: 7, method: 'textDocument/definition', params: { textDocument: { uri: 'file:///nav.zc' }, position: { line: before.split('\n').length - 1, character: before.length - before.lastIndexOf('\n') - 1 } } });
+	s.send({ jsonrpc: '2.0', id: 8, method: 'zc/source', params: { path: '/rt.zc' } });
+	s.send({ jsonrpc: '2.0', method: 'exit' });
+	const loc = s.replies[7] && s.replies[7].result && s.replies[7].result[0];
+	check(loc && loc.uri === 'tinyvm:/rt.zc', 's_to_n opens the embedded runtime source', loc);
+	const source = s.replies[8] && s.replies[8].result;
+	const line = source && loc && source.split('\n')[loc.range.start.line];
+	check(line && line.slice(loc.range.start.character, loc.range.end.character) === 's_to_n' && source === fs.readFileSync(path.join(__dirname, '..', '..', 'src', 'runtime', 'rt.zc'), 'utf8'), 'the virtual runtime source matches its declaration');
+}
 // a document that is bigger than one feed: the input is split and comes out whole
 {
 	let big = 'int main() {\n';