refactor(quick-create): skip daemon CLI version gate in dev

Restores the gate (reverts the full-removal commit) and bypasses it in
non-production environments instead. The motivation for the original
removal — local source-built daemons report a `git describe` version
like v0.2.15-N-gHASH that parses below 0.2.20 and blocks dev testing —
is now handled by checking APP_ENV on the server and NODE_ENV on the
client. Production keeps the original "needs upgrade" UX.

Co-authored-by: multica-agent <github@multica.ai>

server/pkg/agent/version.go

@@ -1,9 +1,11 @@
 package agent
 
 import (
+	"errors"
 	"fmt"
 	"regexp"
 	"strconv"
+	"strings"
 )
 
 // MinVersions defines the minimum required CLI version for each agent type.
@@ -14,6 +16,46 @@ var MinVersions = map[string]string{
 	"copilot": "1.0.0",   // --output-format json envelope stable from 1.0.x
 }
 
+// MinQuickCreateCLIVersion gates the agent-create (quick-create) flow against
+// the multica CLI version reported by the daemon at registration time. The
+// quick-create prompt that the agent runs depends on CLI behavior introduced
+// after this version (attachment URL handling, no-retry semantics on
+// `multica issue create` failure — see PR #1851); older daemons would either
+// double-create issues or mishandle pasted screenshot URLs. Treated as a hard
+// requirement: missing / unparsable / below this threshold all fail closed.
+const MinQuickCreateCLIVersion = "0.2.20"
+
+// Errors returned by CheckMinCLIVersion. Callers branch on these to surface
+// "needs upgrade" vs "version not reported" with the right user message.
+var (
+	ErrCLIVersionMissing = errors.New("multica CLI version not reported by daemon")
+	ErrCLIVersionTooOld  = errors.New("multica CLI version is below required minimum")
+)
+
+// CheckMinCLIVersion returns nil when `detected` parses as ≥ minimum. Returns
+// ErrCLIVersionMissing for empty or unparsable input, and ErrCLIVersionTooOld
+// when parsable but below the minimum. The caller can check for these
+// sentinel errors with errors.Is to drive the response shape.
+func CheckMinCLIVersion(detected string) error {
+	d := strings.TrimSpace(detected)
+	if d == "" {
+		return ErrCLIVersionMissing
+	}
+	parsed, err := parseSemver(d)
+	if err != nil {
+		return ErrCLIVersionMissing
+	}
+	min, err := parseSemver(MinQuickCreateCLIVersion)
+	if err != nil {
+		// Misconfiguration in the constant itself — fail closed as missing.
+		return ErrCLIVersionMissing
+	}
+	if parsed.lessThan(min) {
+		return ErrCLIVersionTooOld
+	}
+	return nil
+}
+
 // semver holds a parsed semantic version (major.minor.patch).
 type semver struct {
 	Major, Minor, Patch int