sx sync: migrate legacy modules/{fs,process}.sx imports to modules/std/

The June stdlib restructure deleted the flat library modules; the old
paths kept resolving only through a stale zig-out/library install
snapshot. Verified green with that snapshot removed. Drop the empty
src/infra/ — the planned hash/json/cli shims shipped as sx std modules
instead.

src/manifest/manifest.sx

@@ -29,7 +29,7 @@
 // — a bare `parse` would bind to `std.cli`'s `parse` once both modules share
 // one program (the `dist` CLI), which returns a different type.
 jsonp :: #import "modules/std/json.sx";
-#import "modules/fs.sx";
+#import "modules/std/fs.sx";
 #import "../domain/platform.sx";
 #import "../domain/validate.sx";
 

src/publish/publish.sx

@@ -35,7 +35,7 @@
 
 #import "modules/std.sx";
 #import "modules/std/json.sx";
-#import "modules/fs.sx";
+#import "modules/std/fs.sx";
 #import "../domain/platform.sx";
 #import "../domain/app.sx";
 #import "../domain/release.sx";

src/repo/db.sx

@@ -25,7 +25,7 @@
 // — a bare `parse` would bind to `std.cli`'s `parse` once both modules share
 // one program (the `dist` CLI), which returns a different type.
 jsonp :: #import "modules/std/json.sx";
-#import "modules/fs.sx";
+#import "modules/std/fs.sx";
 #import "../domain/platform.sx";
 #import "../domain/app.sx";
 #import "../domain/release.sx";

src/store/store.sx

@@ -26,7 +26,7 @@
 // =====================================================================
 
 #import "modules/std.sx";
-fs   :: #import "modules/fs.sx";
+fs   :: #import "modules/std/fs.sx";
 hash :: #import "modules/std/hash.sx";
 
 // Failure classes for a put. `Stage` covers a failed staging write,

src/validation/artifact_file.sx

@@ -23,7 +23,7 @@
 // =====================================================================
 
 #import "modules/std.sx";
-#import "modules/fs.sx";
+#import "modules/std/fs.sx";
 #import "modules/std/hash.sx";
 #import "../domain/platform.sx";
 #import "../domain/artifact.sx";

tests/cli_dispatch.sx

@@ -21,7 +21,7 @@
 // =====================================================================
 
 #import "modules/std.sx";
-proc :: #import "modules/process.sx";
+proc :: #import "modules/std/process.sx";
 json :: #import "modules/std/json.sx";
 
 // True iff `needle` occurs in `hay`. Plain scan — the captured streams are

tests/publish_happy.sx

@@ -19,8 +19,8 @@
 // PASSES against the real pipeline. Fresh store per run.
 #import "modules/std.sx";
 #import "modules/std/json.sx";
-process :: #import "modules/process.sx";
+process :: #import "modules/std/process.sx";
-fs   :: #import "modules/fs.sx";
+fs   :: #import "modules/std/fs.sx";
 hash :: #import "modules/std/hash.sx";
 
 cstd     :: #library "c";

tests/publish_persist.sx

@@ -22,8 +22,8 @@
 // pass. Fresh store per run.
 #import "modules/std.sx";
 #import "modules/std/json.sx";
-process :: #import "modules/process.sx";
+process :: #import "modules/std/process.sx";
-fs   :: #import "modules/fs.sx";
+fs   :: #import "modules/std/fs.sx";
 
 STORE  :: ".sx-tmp/publish_persist";
 MDIR   :: ".sx-tmp/publish_persist_m";

tests/repo_owns_allocator.sx

@@ -11,7 +11,7 @@
 // growth point wrongly used `context.allocator`, the count would not move
 // (the default allocator is a different, untracked one).
 #import "modules/std.sx";
-process :: #import "modules/process.sx";
+process :: #import "modules/std/process.sx";
 #import "../src/domain/platform.sx";
 #import "../src/domain/app.sx";
 #import "../src/domain/release.sx";

tests/repo_roundtrip.sx

@@ -11,8 +11,8 @@
 // every assertion holds (process.assert aborts otherwise).
 #import "modules/std.sx";
 #import "modules/std/json.sx";
-#import "modules/fs.sx";
+#import "modules/std/fs.sx";
-process :: #import "modules/process.sx";
+process :: #import "modules/std/process.sx";
 #import "../src/domain/platform.sx";
 #import "../src/domain/app.sx";
 #import "../src/domain/release.sx";

tests/repo_transaction.sx

@@ -19,7 +19,7 @@
 //      are absent.
 // Uses a fresh `<root>` under `.sx-tmp/` and cleans up.
 #import "modules/std.sx";
-process :: #import "modules/process.sx";
+process :: #import "modules/std/process.sx";
 #import "../src/domain/platform.sx";
 #import "../src/domain/app.sx";
 #import "../src/domain/release.sx";

tests/store_content_addressed.sx

@@ -13,9 +13,9 @@
 //   4. put_file — a file source produces the same key and bytes.
 // Exits 0 only if every assertion holds (process.assert aborts otherwise).
 #import "modules/std.sx";
-fs      :: #import "modules/fs.sx";
+fs      :: #import "modules/std/fs.sx";
 hash    :: #import "modules/std/hash.sx";
-process :: #import "modules/process.sx";
+process :: #import "modules/std/process.sx";
 #import "../src/store/store.sx";
 
 // SHA-256("abc"), the FIPS 180-4 one-block known-answer vector.