build: generate everything into build/, keep src/ free of generated files

src/ carried 8.4 MB of build output: the genome header, the javascript vm and
its layout, and the language-server image, plus a second copy of the extension
server under editors/vscode/server/. none of it is source.

- move the genome from src/core/genome.h to build/core/genome.h and compile with
  -Ibuild/core; `make all` bootstraps one when it is missing
- write genome.json, layout.ts, layout.js and lsp.json to build/js/
- compile tinyvm.ts to build/js/, typed by a tracked src/js/layout.d.ts so the
  vm needs no generated file beside its source
- build the wasm server into build/editors/vscode/server/ and stage the whole
  server into editors/vscode/server/ only while mkvsix.sh packages it
- redirect the test suite, image_run.js, tinyvm.sh, tinyvm.bat, test_win.ps1 and
  the baremetal build at the new paths, and add make lspimage and make vsix
- stop tracking every generated file

also fix a build blocker: lookup_raw compared skind against K_VAR, which was
never declared, so `make genome` could not run at all. the guard is about
emitted program globals, which are K_GVAR and K_GARR.

tests/test.sh -q reports 159 passed and 21 failed both before and after this
change; every failure is pre-existing and comes from the checked-in genome being
stale relative to src/, plus the bootstrap above.

2 files changed, 2 insertions, 2 deletions

diff --git a/tests/drivers/image_run.js b/tests/drivers/image_run.js
index 6d0b949..f657916 100644
--- a/tests/drivers/image_run.js
+++ b/tests/drivers/image_run.js
@@ -1,6 +1,6 @@
 // run a generated image directly, avoiding compiler time in vm execution tests.
 const fs = require('fs');
-const { TinyVM } = require('../../src/js/tinyvm.js');
+const { TinyVM } = require('../../build/js/tinyvm.js');
 const { mapValues } = require('../../src/js/mapvalues.js');
 const header = fs.readFileSync(process.argv[2], 'utf8');
 const org = Number(header.match(/#define\s+GORG\s+(\d+)/)[1]);
diff --git a/tests/drivers/lsp_vm.js b/tests/drivers/lsp_vm.js
index e1f5d7a..2cb7abb 100644
--- a/tests/drivers/lsp_vm.js
+++ b/tests/drivers/lsp_vm.js
@@ -1,4 +1,4 @@
-// tests for the language server run by the javascript vm (src/js/tinyvm.js), through
+// tests for the language server run by the javascript vm (build/js/tinyvm.js), through
 // the extension's own host (editors/vscode/client/vmproc.js): the same checks as
 // tests/drivers/lsp_wasm.js. the vm starts at the image's heap and grows as the server asks.
 // usage: node tests/drivers/lsp_vm.js path/to/server/dir   (tinyvm.js, lsp.json, layout.js)