fix(release): build kandev binary with -tags fts5 (#1007)

* fix(release): build kandev binary with -tags fts5

The tasks_fts virtual table + sync triggers shipped in v0.50.0 (#914)
require the fts5 SQLite build tag, which apps/backend/Makefile already
sets. The release workflow did not, so published binaries lack the
module and fail to open any DB that an FTS5-enabled build previously
touched ("no such module: fts5" during schema init).

Add -tags fts5 to the kandev build and propagate the standard version
ldflags from the Makefile so kandev --version reports the released tag.

Fixes #1006.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

* fix(release): propagate version ldflags to cross-compiled agentctl

The linux/amd64 agentctl helper is built in a separate workflow step
whose shell does not inherit LDFLAGS from the previous build step.
Export LDFLAGS via \$GITHUB_ENV so the cross-compiled binary embeds
the same Version/Commit/BuildTime metadata as the matrix-built
agentctl, matching apps/backend/Makefile's build-agentctl-linux
target.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

---------

Co-authored-by: Kandev Agent <agent@kandev.dev>
Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

.github/workflows/release.yml

@@ -360,15 +360,31 @@ jobs:
           sudo apt-get update
           sudo apt-get install -y gcc-mingw-w64-x86-64
 
+      # The `fts5` build tag is REQUIRED on the kandev binary. The office
+      # task search migrations create a `tasks_fts` virtual table using
+      # `USING fts5(...)`; without the tag, mattn/go-sqlite3 lacks the
+      # module and any subsequent boot against a DB that already has the
+      # virtual table fails with "no such module: fts5" during schema init.
+      # See issue #1006 for the regression this prevents.
+      #
+      # Version ldflags mirror apps/backend/Makefile so `kandev --version`
+      # reports the released tag instead of the build-time default "dev".
       - name: Build backend binaries
         env:
           CC: ${{ matrix.cc || '' }}
+          KANDEV_VERSION: ${{ needs.prepare.outputs.tag }}
         run: |
           cd apps/backend
           mkdir -p bin
           EXT=${{ matrix.goos == 'windows' && '.exe' || '' }}
-          go build -o bin/kandev${EXT} ./cmd/kandev
-          go build -o bin/agentctl${EXT} ./cmd/agentctl
+          COMMIT=$(git rev-parse --short HEAD)
+          BUILD_TIME=$(date -u '+%Y-%m-%dT%H:%M:%SZ')
+          LDFLAGS="-s -w -X main.Version=${KANDEV_VERSION} -X main.Commit=${COMMIT} -X main.BuildTime=${BUILD_TIME}"
+          # Export to subsequent steps so the cross-compiled agentctl helper
+          # below gets the same version metadata (matches Makefile parity).
+          echo "LDFLAGS=${LDFLAGS}" >> "${GITHUB_ENV}"
+          go build -tags fts5 -ldflags "${LDFLAGS}" -o bin/kandev${EXT} ./cmd/kandev
+          go build -ldflags "${LDFLAGS}" -o bin/agentctl${EXT} ./cmd/agentctl
 
       # Cross-compile a linux/amd64 agentctl regardless of the host platform.
       # Remote executors (local Docker, remote Docker, Sprites) bind-mount this
@@ -379,7 +395,7 @@ jobs:
       - name: Build linux/amd64 agentctl helper
         run: |
           cd apps/backend
-          GOOS=linux GOARCH=amd64 CGO_ENABLED=0 CC= go build -o bin/agentctl-linux-amd64 ./cmd/agentctl
+          GOOS=linux GOARCH=amd64 CGO_ENABLED=0 CC= go build -ldflags "${LDFLAGS}" -o bin/agentctl-linux-amd64 ./cmd/agentctl
 
       - name: Package bundle
         run: |