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

7 files changed, 31 insertions, 0 deletions

diff --git a/tests/actor/reject/explicit_this.zc b/tests/actor/reject/explicit_this.zc
new file mode 100644
index 0000000..caa30d0
--- /dev/null
+++ b/tests/actor/reject/explicit_this.zc
@@ -0,0 +1,4 @@
+namespace;
+include rt, actor;
+actor Counter { int value; fn add(Counter* this, int n) { this.value += n; return this.value; } }
+fn main() { Counter c; return c.add(1); }
diff --git a/tests/actor/reject/generic_input.zc b/tests/actor/reject/generic_input.zc
new file mode 100644
index 0000000..d13bc7c
--- /dev/null
+++ b/tests/actor/reject/generic_input.zc
@@ -0,0 +1,5 @@
+namespace;
+include rt, actor;
+typecheck on;
+actor Counter<T> { T handle(T value) { return value; } }
+fn main() { Counter<int>* a = rt.new(Counter<int>); a.spawn(); a.send("wrong"); return 0; }
diff --git a/tests/actor/reject/generic_method_return.zc b/tests/actor/reject/generic_method_return.zc
new file mode 100644
index 0000000..4b2ba9b
--- /dev/null
+++ b/tests/actor/reject/generic_method_return.zc
@@ -0,0 +1,5 @@
+namespace;
+include rt;
+typecheck on;
+struct Box<T> { T wrong(T input) { return "wrong"; } }
+fn main() { Box<int> a; a.wrong(7); return 0; }
diff --git a/tests/actor/reject/input_type.zc b/tests/actor/reject/input_type.zc
new file mode 100644
index 0000000..259f772
--- /dev/null
+++ b/tests/actor/reject/input_type.zc
@@ -0,0 +1,5 @@
+namespace;
+include rt, actor;
+typecheck on;
+int handle(int n) { return n; }
+fn main() { actor.Actor<int,int>* a = rt.new(actor.Actor<int,int>); a.spawn(handle); a.send("wrong"); a.close(); return 0; }
diff --git a/tests/actor/reject/nested_missing_import.zc b/tests/actor/reject/nested_missing_import.zc
new file mode 100644
index 0000000..bdf42bd
--- /dev/null
+++ b/tests/actor/reject/nested_missing_import.zc
@@ -0,0 +1,3 @@
+namespace;
+include run;
+fn main() { run.evals("return rt.len_w(\"abc\");"); return 0; }
diff --git a/tests/actor/reject/no_include.zc b/tests/actor/reject/no_include.zc
new file mode 100644
index 0000000..662bb4f
--- /dev/null
+++ b/tests/actor/reject/no_include.zc
@@ -0,0 +1,4 @@
+namespace;
+include rt;
+actor Counter { int value; }
+fn main() { return 0; }
diff --git a/tests/actor/reject/output_type.zc b/tests/actor/reject/output_type.zc
new file mode 100644
index 0000000..1d0df34
--- /dev/null
+++ b/tests/actor/reject/output_type.zc
@@ -0,0 +1,5 @@
+namespace;
+include rt, actor;
+typecheck on;
+int handle(int n) { return n; }
+fn main() { actor.Actor<int,int>* a = rt.new(actor.Actor<int,int>); a.spawn(handle); a.recv(fn(char* n) { return 0; }); a.close(); return 0; }