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

13 files changed, 31 insertions, 1 deletions

diff --git a/tests/typeerrors/arg.zc b/tests/typeerrors/arg.zc
index bf39e85..954e776 100644
--- a/tests/typeerrors/arg.zc
+++ b/tests/typeerrors/arg.zc
@@ -1,5 +1,8 @@
+namespace;
+include rt;
+
 // expect: type error: argument: expected point*, got int*
 typecheck on;
 struct point { int x, y; };
 int f(point* p) { return p.x; }
-fn main() { int* q = new(int); f(q); free(d*q); return 0; }
+fn main() { int* q = rt.new(int); f(q); rt.free(d*q); return 0; }
diff --git a/tests/typeerrors/arith.zc b/tests/typeerrors/arith.zc
index eda4aec..fada770 100644
--- a/tests/typeerrors/arith.zc
+++ b/tests/typeerrors/arith.zc
@@ -1,3 +1,5 @@
+namespace;
+
 // expect: type error: arithmetic needs numbers, got int*
 typecheck on;
 fn main() { int* p = 0; int x = p * 2; return x; }
diff --git a/tests/typeerrors/assign.zc b/tests/typeerrors/assign.zc
index b83e1a2..bbbf0eb 100644
--- a/tests/typeerrors/assign.zc
+++ b/tests/typeerrors/assign.zc
@@ -1,3 +1,5 @@
+namespace;
+
 // expect: type error: initializer: expected char*, got int
 typecheck on;
 fn main() { char* s = 5; return 0; }
diff --git a/tests/typeerrors/call.zc b/tests/typeerrors/call.zc
index 7b03dbf..f717621 100644
--- a/tests/typeerrors/call.zc
+++ b/tests/typeerrors/call.zc
@@ -1,3 +1,5 @@
+namespace;
+
 // expect: type error: only functions can be called, got int
 typecheck on;
 fn main() { int k = 3; return k(1); }
diff --git a/tests/typeerrors/closure_result_mismatch.zc b/tests/typeerrors/closure_result_mismatch.zc
new file mode 100644
index 0000000..2727d0b
--- /dev/null
+++ b/tests/typeerrors/closure_result_mismatch.zc
@@ -0,0 +1,5 @@
+namespace;
+
+// expect: type error: return value: expected int, got char*
+typecheck on;
+fn main() { let f = fn:int(int x) { return "no"; }; return f(1); }
diff --git a/tests/typeerrors/deref.zc b/tests/typeerrors/deref.zc
index ed030f5..53869cf 100644
--- a/tests/typeerrors/deref.zc
+++ b/tests/typeerrors/deref.zc
@@ -1,3 +1,5 @@
+namespace;
+
 // expect: type error: only pointers can be dereferenced, got int
 typecheck on;
 fn main() { int x = 3; return *x; }
diff --git a/tests/typeerrors/enum_int.zc b/tests/typeerrors/enum_int.zc
index c710d50..0d09ad9 100644
--- a/tests/typeerrors/enum_int.zc
+++ b/tests/typeerrors/enum_int.zc
@@ -1,3 +1,5 @@
+namespace;
+
 // expect: type error: initializer: expected color, got int
 typecheck on;
 enum color { RED, GREEN = 5, BLUE };
diff --git a/tests/typeerrors/enum_other.zc b/tests/typeerrors/enum_other.zc
index 5b27370..ffa36d7 100644
--- a/tests/typeerrors/enum_other.zc
+++ b/tests/typeerrors/enum_other.zc
@@ -1,3 +1,5 @@
+namespace;
+
 // expect: type error: initializer: expected color, got size
 typecheck on;
 enum color { RED, GREEN = 5, BLUE };
diff --git a/tests/typeerrors/field.zc b/tests/typeerrors/field.zc
index ba03697..747b6e3 100644
--- a/tests/typeerrors/field.zc
+++ b/tests/typeerrors/field.zc
@@ -1,3 +1,5 @@
+namespace;
+
 // expect: point has no field z
 struct point { int x, y; };
 fn main() { point p; return p.z; }
diff --git a/tests/typeerrors/generic.zc b/tests/typeerrors/generic.zc
index 04e5381..3e22519 100644
--- a/tests/typeerrors/generic.zc
+++ b/tests/typeerrors/generic.zc
@@ -1,3 +1,5 @@
+namespace;
+
 // expect: type error: argument: expected int, got char*
 typecheck on;
 T same<T>(T a, T b) { return a; }
diff --git a/tests/typeerrors/notstruct.zc b/tests/typeerrors/notstruct.zc
index 0dff6bd..9dc4347 100644
--- a/tests/typeerrors/notstruct.zc
+++ b/tests/typeerrors/notstruct.zc
@@ -1,2 +1,4 @@
+namespace;
+
 // expect: .x: that's a int, not a struct or a pointer to one
 fn main() { int n = 1; return n.x; }
diff --git a/tests/typeerrors/ret.zc b/tests/typeerrors/ret.zc
index d44267e..8ac4edb 100644
--- a/tests/typeerrors/ret.zc
+++ b/tests/typeerrors/ret.zc
@@ -1,3 +1,5 @@
+namespace;
+
 // expect: type error: return value: expected bool, got char*
 typecheck on;
 bool f() { return "no"; }
diff --git a/tests/typeerrors/voidret.zc b/tests/typeerrors/voidret.zc
index 86c9c17..c273308 100644
--- a/tests/typeerrors/voidret.zc
+++ b/tests/typeerrors/voidret.zc
@@ -1,3 +1,5 @@
+namespace;
+
 // expect: type error: return value: expected void, got int
 typecheck on;
 void f() { return 3; }