feat: whitepaper comments

foundations/whitepapers/comments.mdx

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+---
+title: "Whitepapers comments"
+---
+
+Clarifications and status notes for the whitepapers.
+
+## TON Virtual Machine (tvm.pdf)
+
+### 1.3.2. List of control registers
+
+The zero element of the `c7` tuple is an environment information (which itself is also a tuple). The remaining 255 slots are used for global variables. [`[i] SETGLOB`](/tvm/instructions#f87_-setglob) modifies `c7`, inserting an element with index `i`, [`[i] GETGLOB`](/tvm/instructions#f85_-getglob) reads `i`-th element from `c7`. See [TVM > Registers](/tvm/registers#c7-%E2%80%94-environment-information-and-global-variables) for details.
+
+### 4.4. Continuations as objects
+
+It is possible to construct such objects, however, no high-level language implemented it yet.
+
+### 4.5.7. List of predefined exceptions
+
+Exit code `11` is thrown by [standard function selector](/tvm/registers#c3-—-function-selector) if there is no function with given id. Also it is thrown by [`SENDMSG`](/tvm/instructions#fb08-sendmsg) in case of invalid message.
+
+### 5.1. Codepages and interoperability of different TVM versions
+
+Currently only codepage `0` implemented. 
+
+### A. Instructions and opcodes
+
+Basic gas price is `10 + b`, not `10 + b + 5r`. See [TVM > Gas](/tvm/gas) for details.
+
+Provided instruction list is obsolete. Consider use [TVM > Instructions](/tvm/instructions).
+
+### B.2. Step function of TVM
+
+"Reference implementation of TVM" and codepages `-1` and `-2` are not implemented yet.
+
+## Fift, `fiftbase.pdf`
+
+### 1 Overview
+
+> The dictionary is supposed to be split into several vocabularies, or namespaces; however, namespaces are not implemented yet, so all words are currently defined in the same global namespace.
+
+Namespaces and context switching are now implemented — Fift words are defined in the default dictionary and accessible through the global namespace called `Fift`.
+
+It is now possible to add new namespaces with the `namespace` word or switch dictionary contexts on the fly. It is also possible to define words or named constants directly under those namespaces and reference words from different namespaces:
+
+```fift
+namespace My
+
+"a" constant a
+"b" constant b
+"c" constant c
+
+a b c .s { drop } 3 times // "a" "b" "c"
+
+My definitions
+"b-my" constant b
+"c-my" constant c
+"d-my" constant d
+
+a b c d .s { drop } 4 times // "a" "b-my" "c-my" "d-my"
+
+Fift definitions
+a b c .s { drop } 3 times // "a" "b-my" "c-my" "d-my"
+
+My b My c My d .s { drop } 3 times // "b-my" "c-my" "d-my"
+a b c .s { drop } 3 times // "a" "b" "c" "d"
+
+My definitions
+a b c d .s { drop } 4 times // "a" "b-my" "c-my" "d-my"
+Fift a Fift b Fift c d .s { drop } 4 times // "a" "b" "c" "d-my"
+
+Fift definitions
+cr
+My-wordlist @
+{ drop type -1 } hmapforeach drop cr // "b " "d " "c "
+```
+