docker build . stamps the git tag or short commit, not dev (closes #154)

A plain `docker build .` now stamps the version from git rather than `dev`/`0.0.0`. After `tsc`, `script/build` writes into `dist/package.json` the version `script/version` decides: `VERSION` when given, otherwise `git describe --tags --always` (the tag; or tag, commits since and short commit; or the short commit), otherwise `package.json`'s. A checkout with `.git` that yields an empty, `dev` or `unknown` version fails the build. `.dockerignore` sends `.git` but not `.git/config`, so no remote URL or credential reaches the image. `ARG VERSION` has no default, and the host scripts' version still wins.

Not changed: `REPO_POLICIES.md` still says `ARG VERSION=dev` until the shared policy changes.

Model: opus-5-5
Co-authored-by: clawbot <sneak+clawbot@sneak.cloud>

script/build

@@ -1,7 +1,7 @@
 #!/bin/sh
-# script/build: compile the TypeScript sources into dist/, then verify that
-# the artifacts package.json advertises are among the files the compiler
-# actually wrote. tsc reports success by exit status alone and knows nothing
+# script/build: compile the TypeScript sources into dist/, stamp the version
+# script/version prints into it, then verify that the artifacts package.json
+# advertises are among the files the compiler actually wrote. tsc reports success by exit status alone and knows nothing
 # about the manifest, so without this step a green build can still ship a
 # package whose main, types or bin resolve to nothing. Our own extension to
 # scripts-to-rule-them-all.
@@ -46,13 +46,24 @@ for (const bin of bins) {
 }
 
 # src/index.ts imports ../package.json for the version, which tsc copies to
-# dist/package.json. Running the built CLI proves that import resolves from
-# dist/ and reports the version package.json declares.
+# dist/package.json. The version script/version prints is written into that
+# copy only; the repo's own package.json is left as it is.
+stamp_version() {
+    node -e '
+const { readFileSync, writeFileSync } = require("node:fs");
+
+const pkg = JSON.parse(readFileSync("dist/package.json", "utf-8"));
+pkg.version = process.argv[1];
+writeFileSync("dist/package.json", JSON.stringify(pkg, null, 4) + "\n");
+' "$1"
+}
+
+# Running the built CLI proves the import resolves from dist/ and reports
+# the stamped version.
 verify_version() {
     built="$(node dist/bin/quak.js --version)"
-    declared="$(node -p 'require("./package.json").version')"
-    if [ "$built" != "$declared" ]; then
-        echo "build: dist/bin/quak.js reports $built, package.json declares $declared" >&2
+    if [ "$built" != "$1" ]; then
+        echo "build: dist/bin/quak.js reports $built, the build stamped $1" >&2
         exit 1
     fi
     echo "build: dist/bin/quak.js reports version $built"
@@ -60,9 +71,12 @@ verify_version() {
 
 main() {
     cd "$ROOT"
+    # Own line, so that a failing script/version stops the build.
+    version="$("$ROOT/script/version")"
     yarn run tsc
+    stamp_version "$version"
     verify_entrypoints
-    verify_version
+    verify_version "$version"
 }
 
 main "$@"