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, 27 insertions, 0 deletions

diff --git a/tests/programs/replace_owner.zc b/tests/programs/replace_owner.zc
new file mode 100644
index 0000000..8318616
--- /dev/null
+++ b/tests/programs/replace_owner.zc
@@ -0,0 +1,27 @@
+namespace;
+include rt;
+
+// a released owner can receive a same-scope replacement, without copying owners.
+int*.u growing(int n) {
+	int* buffer = rt.new(int), next; int i = 0;
+	while (i < n) {
+		if (!(i & 1)) {
+			next = rt.new(int);
+			*next = i;
+			rt.free(buffer);
+			buffer = next;
+		}
+		i++;
+	}
+	return buffer;
+}
+fn main() {
+	let base = rt.live_objects();
+	{
+		let result = growing(100); rt.put_n(*result); rt.put_c(32);
+		int* slot = rt.new(int), replacement = rt.new(int); *replacement = 7;
+		rt.free(slot); slot = replacement; rt.put_n(*slot); rt.put_c(32);
+		rt.free(slot); slot = rt.new(int); *slot = 9; rt.put_n(*slot); rt.put_c(32);
+	}
+	rt.gc(); rt.put_n(rt.live_objects() - base); rt.put_c(10);
+}