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, 31 insertions, 0 deletions

diff --git a/tests/drivers/hints_test.js b/tests/drivers/hints_test.js
new file mode 100644
index 0000000..8bb1934
--- /dev/null
+++ b/tests/drivers/hints_test.js
@@ -0,0 +1,31 @@
+// hints are informational diagnostics (severity 3) and follow positional hints on / small / off directives.
+// usage: node tests/drivers/hints_test.js path/to/zclsp
+const assert = require('assert');
+const cp = require('child_process');
+const server = process.argv[2];
+const frame = m => { const b = Buffer.from(JSON.stringify(m)); return Buffer.concat([Buffer.from('Content-Length: ' + b.length + '\r\n\r\n'), b]); };
+function diagnostics(text) {
+    const uri = 'file:///hints.zc';
+    const input = Buffer.concat([
+        { jsonrpc: '2.0', id: 1, method: 'initialize', params: {} },
+        { jsonrpc: '2.0', method: 'textDocument/didOpen', params: { textDocument: { uri, version: 1, languageId: 'zc', text } } },
+        { jsonrpc: '2.0', method: 'exit' }].map(frame));
+    const r = cp.spawnSync(server, process.argv.slice(3), { input, timeout: 20000, maxBuffer: 4 << 20 });
+    assert.strictEqual(r.status, 0, String(r.stderr));
+    let d = r.stdout, out = [];
+    while (d.length) {
+        const e = d.indexOf('\r\n\r\n'), n = Number(/Content-Length:\s*(\d+)/i.exec(d.subarray(0, e).toString())[1]);
+        const m = JSON.parse(d.subarray(e + 4, e + 4 + n)); d = d.subarray(e + 4 + n);
+        if (m.method === 'textDocument/publishDiagnostics') out = m.params.diagnostics;
+    }
+    return out;
+}
+const names = ds => ds.map(d => d.message.split(' ')[0]).sort().join(',');
+const flow = 'fn main() {\n let a = 1;\n hints small;\n let b = 2;\n int c = 5 * 8;\n hints off;\n let d = 3;\n int k = 3 * 4;\n hints on;\n let e = 4;\n return 0;\n}\n';
+const ds = diagnostics(flow);
+assert.ok(ds.length > 0 && ds.every(d => d.severity === (d.range.start.line === 3 || d.range.start.line === 4 ? 4 : 3)), 'small uses compact severity 4; on uses informational severity 3: ' + JSON.stringify(ds));
+assert.strictEqual(names(ds), 'a,b,c,e,multiplying', 'off suppresses hints; small retains them with compact markers');
+const style = diagnostics('fn main() {\n int n = 1;\n n = n * 8;\n hints small;\n n = n * 16;\n return n;\n}\n');
+assert.strictEqual(style.filter(d => /is a shift/.test(d.message)).length, 2, 'small retains style hints with compact markers');
+assert.strictEqual(diagnostics('fn main() { int x = ; return 0; }').filter(d => d.severity === 1).length > 0, true);
+console.log('ok   hints are blue information diagnostics with positional on, small and off');