build: version-prefix binaries and individual checksums

- Add version to binary names (ctx-0.1.0-linux-amd64 instead of ctx-linux-amd64)
- Generate individual .sha256 files per binary instead of single checksums.txt
- Update docs with new binary names and checksum verification instructions
- Fix release workflow to use ctx-* pattern (was amem-*)
- Rebuild site with updated installation instructions

Signed-off-by: Jose Alekhinne <alekhinejose@gmail.com>

Author: josealekhine

Makefile

@@ -87,9 +87,9 @@ clean:
 	rm -f $(BINARY)
 	rm -rf dist/
 
-## release: Build for all platforms
+## release: Build for all platforms (reads VERSION file)
 release:
-	./hack/build-all.sh
+	./hack/build-all.sh $$(cat VERSION | tr -d '[:space:]')
 
 ## release-version: Build for all platforms with version
 release-version:
@@ -100,6 +100,18 @@ release-version:
 release-tag:
 	./hack/release.sh
 
+## tag: Create signed git tag from VERSION file
+tag:
+	./hack/tag.sh
+
+## release-notes: Generate release notes (use Claude Code slash command)
+release-notes:
+	@echo "To generate release notes, run in Claude Code:"
+	@echo ""
+	@echo "  /release-notes"
+	@echo ""
+	@echo "This will analyze commits since the last tag and write to dist/RELEASE_NOTES.md"
+
 ## dogfood: Start dogfooding in a target folder
 dogfood:
 	@test -n "$(TARGET)" || (echo "Usage: make dogfood TARGET=~/WORKSPACE/ctx-dogfood" && exit 1)

hack/build-all.sh

@@ -34,9 +34,15 @@ TARGETS=(
 echo "Building Context CLI v${VERSION}"
 echo "========================================="
 
-# Clean and create output directory
+# Clean and create output directory (preserve RELEASE_NOTES.md if it exists)
+if [ -f "${OUTPUT_DIR}/RELEASE_NOTES.md" ]; then
+  mv "${OUTPUT_DIR}/RELEASE_NOTES.md" /tmp/RELEASE_NOTES.md.bak
+fi
 rm -rf "${OUTPUT_DIR}"
 mkdir -p "${OUTPUT_DIR}"
+if [ -f /tmp/RELEASE_NOTES.md.bak ]; then
+  mv /tmp/RELEASE_NOTES.md.bak "${OUTPUT_DIR}/RELEASE_NOTES.md"
+fi
 
 # Build for each target
 for target in "${TARGETS[@]}"; do