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, 2 insertions, 0 deletions

diff --git a/docs/design/memory.md b/docs/design/memory.md
index bcbdf35..c282df5 100644
--- a/docs/design/memory.md
+++ b/docs/design/memory.md
@@ -68,6 +68,8 @@ document slots, uri text, hover text, declaration types, parsed type spans, reso
 
 inference function records retain stable addresses while their index grows. inference edits, replacement text, and annotation verification buffers also grow; later declarations are not dropped at the original function-count or edit-count limits. protocol method names, request identifiers, json keys, nesting paths, and header lines also grow; request identifiers are echoed in full.
 
+completed hover, navigation, token and completion replies have a bounded 64-entry cache. keys include the document generation, request position and include epoch. source updates, included-file updates, saves and close/reopen invalidate dependent replies; cached json values do not retain mutable compiler-table addresses. `zc/cacheStats` reports cache hits, misses and compiler checks for regression tests.
+
 ## freestanding backing
 
 the stub and board ports reserve `MICRO_PORT_WORDS` cells at build time; it defaults to the initial image and heap size. the vm's active size and growth limit still change at runtime, within that physical backing. set the macro when linking a board with more reserved ram. a rejected physical allocation preserves the current memory. hosted maps keep their heap above the fixed regions; the historical `fixed` preset retains its bounded layout for compatibility.